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Linux/security/smack/smack_lsm.c

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  1 /*
  2  *  Simplified MAC Kernel (smack) security module
  3  *
  4  *  This file contains the smack hook function implementations.
  5  *
  6  *  Authors:
  7  *      Casey Schaufler <casey@schaufler-ca.com>
  8  *      Jarkko Sakkinen <jarkko.sakkinen@intel.com>
  9  *
 10  *  Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
 11  *  Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
 12  *                Paul Moore <paul@paul-moore.com>
 13  *  Copyright (C) 2010 Nokia Corporation
 14  *  Copyright (C) 2011 Intel Corporation.
 15  *
 16  *      This program is free software; you can redistribute it and/or modify
 17  *      it under the terms of the GNU General Public License version 2,
 18  *      as published by the Free Software Foundation.
 19  */
 20 
 21 #include <linux/xattr.h>
 22 #include <linux/pagemap.h>
 23 #include <linux/mount.h>
 24 #include <linux/stat.h>
 25 #include <linux/kd.h>
 26 #include <asm/ioctls.h>
 27 #include <linux/ip.h>
 28 #include <linux/tcp.h>
 29 #include <linux/udp.h>
 30 #include <linux/dccp.h>
 31 #include <linux/slab.h>
 32 #include <linux/mutex.h>
 33 #include <linux/pipe_fs_i.h>
 34 #include <net/cipso_ipv4.h>
 35 #include <net/ip.h>
 36 #include <net/ipv6.h>
 37 #include <linux/audit.h>
 38 #include <linux/magic.h>
 39 #include <linux/dcache.h>
 40 #include <linux/personality.h>
 41 #include <linux/msg.h>
 42 #include <linux/shm.h>
 43 #include <linux/binfmts.h>
 44 #include <linux/parser.h>
 45 #include "smack.h"
 46 
 47 #define TRANS_TRUE      "TRUE"
 48 #define TRANS_TRUE_SIZE 4
 49 
 50 #define SMK_CONNECTING  0
 51 #define SMK_RECEIVING   1
 52 #define SMK_SENDING     2
 53 
 54 #ifdef SMACK_IPV6_PORT_LABELING
 55 DEFINE_MUTEX(smack_ipv6_lock);
 56 static LIST_HEAD(smk_ipv6_port_list);
 57 #endif
 58 static struct kmem_cache *smack_inode_cache;
 59 int smack_enabled;
 60 
 61 static const match_table_t smk_mount_tokens = {
 62         {Opt_fsdefault, SMK_FSDEFAULT "%s"},
 63         {Opt_fsfloor, SMK_FSFLOOR "%s"},
 64         {Opt_fshat, SMK_FSHAT "%s"},
 65         {Opt_fsroot, SMK_FSROOT "%s"},
 66         {Opt_fstransmute, SMK_FSTRANS "%s"},
 67         {Opt_error, NULL},
 68 };
 69 
 70 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 71 static char *smk_bu_mess[] = {
 72         "Bringup Error",        /* Unused */
 73         "Bringup",              /* SMACK_BRINGUP_ALLOW */
 74         "Unconfined Subject",   /* SMACK_UNCONFINED_SUBJECT */
 75         "Unconfined Object",    /* SMACK_UNCONFINED_OBJECT */
 76 };
 77 
 78 static void smk_bu_mode(int mode, char *s)
 79 {
 80         int i = 0;
 81 
 82         if (mode & MAY_READ)
 83                 s[i++] = 'r';
 84         if (mode & MAY_WRITE)
 85                 s[i++] = 'w';
 86         if (mode & MAY_EXEC)
 87                 s[i++] = 'x';
 88         if (mode & MAY_APPEND)
 89                 s[i++] = 'a';
 90         if (mode & MAY_TRANSMUTE)
 91                 s[i++] = 't';
 92         if (mode & MAY_LOCK)
 93                 s[i++] = 'l';
 94         if (i == 0)
 95                 s[i++] = '-';
 96         s[i] = '\0';
 97 }
 98 #endif
 99 
100 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 static int smk_bu_note(char *note, struct smack_known *sskp,
102                        struct smack_known *oskp, int mode, int rc)
103 {
104         char acc[SMK_NUM_ACCESS_TYPE + 1];
105 
106         if (rc <= 0)
107                 return rc;
108         if (rc > SMACK_UNCONFINED_OBJECT)
109                 rc = 0;
110 
111         smk_bu_mode(mode, acc);
112         pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
113                 sskp->smk_known, oskp->smk_known, acc, note);
114         return 0;
115 }
116 #else
117 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
118 #endif
119 
120 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
121 static int smk_bu_current(char *note, struct smack_known *oskp,
122                           int mode, int rc)
123 {
124         struct task_smack *tsp = current_security();
125         char acc[SMK_NUM_ACCESS_TYPE + 1];
126 
127         if (rc <= 0)
128                 return rc;
129         if (rc > SMACK_UNCONFINED_OBJECT)
130                 rc = 0;
131 
132         smk_bu_mode(mode, acc);
133         pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
134                 tsp->smk_task->smk_known, oskp->smk_known,
135                 acc, current->comm, note);
136         return 0;
137 }
138 #else
139 #define smk_bu_current(note, oskp, mode, RC) (RC)
140 #endif
141 
142 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
143 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
144 {
145         struct task_smack *tsp = current_security();
146         struct smack_known *smk_task = smk_of_task_struct(otp);
147         char acc[SMK_NUM_ACCESS_TYPE + 1];
148 
149         if (rc <= 0)
150                 return rc;
151         if (rc > SMACK_UNCONFINED_OBJECT)
152                 rc = 0;
153 
154         smk_bu_mode(mode, acc);
155         pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
156                 tsp->smk_task->smk_known, smk_task->smk_known, acc,
157                 current->comm, otp->comm);
158         return 0;
159 }
160 #else
161 #define smk_bu_task(otp, mode, RC) (RC)
162 #endif
163 
164 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
165 static int smk_bu_inode(struct inode *inode, int mode, int rc)
166 {
167         struct task_smack *tsp = current_security();
168         struct inode_smack *isp = inode->i_security;
169         char acc[SMK_NUM_ACCESS_TYPE + 1];
170 
171         if (isp->smk_flags & SMK_INODE_IMPURE)
172                 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
173                         inode->i_sb->s_id, inode->i_ino, current->comm);
174 
175         if (rc <= 0)
176                 return rc;
177         if (rc > SMACK_UNCONFINED_OBJECT)
178                 rc = 0;
179         if (rc == SMACK_UNCONFINED_SUBJECT &&
180             (mode & (MAY_WRITE | MAY_APPEND)))
181                 isp->smk_flags |= SMK_INODE_IMPURE;
182 
183         smk_bu_mode(mode, acc);
184 
185         pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
186                 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
187                 inode->i_sb->s_id, inode->i_ino, current->comm);
188         return 0;
189 }
190 #else
191 #define smk_bu_inode(inode, mode, RC) (RC)
192 #endif
193 
194 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
195 static int smk_bu_file(struct file *file, int mode, int rc)
196 {
197         struct task_smack *tsp = current_security();
198         struct smack_known *sskp = tsp->smk_task;
199         struct inode *inode = file_inode(file);
200         struct inode_smack *isp = inode->i_security;
201         char acc[SMK_NUM_ACCESS_TYPE + 1];
202 
203         if (isp->smk_flags & SMK_INODE_IMPURE)
204                 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
205                         inode->i_sb->s_id, inode->i_ino, current->comm);
206 
207         if (rc <= 0)
208                 return rc;
209         if (rc > SMACK_UNCONFINED_OBJECT)
210                 rc = 0;
211 
212         smk_bu_mode(mode, acc);
213         pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
214                 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
215                 inode->i_sb->s_id, inode->i_ino, file,
216                 current->comm);
217         return 0;
218 }
219 #else
220 #define smk_bu_file(file, mode, RC) (RC)
221 #endif
222 
223 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
224 static int smk_bu_credfile(const struct cred *cred, struct file *file,
225                                 int mode, int rc)
226 {
227         struct task_smack *tsp = cred->security;
228         struct smack_known *sskp = tsp->smk_task;
229         struct inode *inode = file_inode(file);
230         struct inode_smack *isp = inode->i_security;
231         char acc[SMK_NUM_ACCESS_TYPE + 1];
232 
233         if (isp->smk_flags & SMK_INODE_IMPURE)
234                 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
235                         inode->i_sb->s_id, inode->i_ino, current->comm);
236 
237         if (rc <= 0)
238                 return rc;
239         if (rc > SMACK_UNCONFINED_OBJECT)
240                 rc = 0;
241 
242         smk_bu_mode(mode, acc);
243         pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
244                 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
245                 inode->i_sb->s_id, inode->i_ino, file,
246                 current->comm);
247         return 0;
248 }
249 #else
250 #define smk_bu_credfile(cred, file, mode, RC) (RC)
251 #endif
252 
253 /**
254  * smk_fetch - Fetch the smack label from a file.
255  * @name: type of the label (attribute)
256  * @ip: a pointer to the inode
257  * @dp: a pointer to the dentry
258  *
259  * Returns a pointer to the master list entry for the Smack label,
260  * NULL if there was no label to fetch, or an error code.
261  */
262 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
263                                         struct dentry *dp)
264 {
265         int rc;
266         char *buffer;
267         struct smack_known *skp = NULL;
268 
269         if (!(ip->i_opflags & IOP_XATTR))
270                 return ERR_PTR(-EOPNOTSUPP);
271 
272         buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
273         if (buffer == NULL)
274                 return ERR_PTR(-ENOMEM);
275 
276         rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
277         if (rc < 0)
278                 skp = ERR_PTR(rc);
279         else if (rc == 0)
280                 skp = NULL;
281         else
282                 skp = smk_import_entry(buffer, rc);
283 
284         kfree(buffer);
285 
286         return skp;
287 }
288 
289 /**
290  * new_inode_smack - allocate an inode security blob
291  * @skp: a pointer to the Smack label entry to use in the blob
292  *
293  * Returns the new blob or NULL if there's no memory available
294  */
295 static struct inode_smack *new_inode_smack(struct smack_known *skp)
296 {
297         struct inode_smack *isp;
298 
299         isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
300         if (isp == NULL)
301                 return NULL;
302 
303         isp->smk_inode = skp;
304         isp->smk_flags = 0;
305         mutex_init(&isp->smk_lock);
306 
307         return isp;
308 }
309 
310 /**
311  * new_task_smack - allocate a task security blob
312  * @task: a pointer to the Smack label for the running task
313  * @forked: a pointer to the Smack label for the forked task
314  * @gfp: type of the memory for the allocation
315  *
316  * Returns the new blob or NULL if there's no memory available
317  */
318 static struct task_smack *new_task_smack(struct smack_known *task,
319                                         struct smack_known *forked, gfp_t gfp)
320 {
321         struct task_smack *tsp;
322 
323         tsp = kzalloc(sizeof(struct task_smack), gfp);
324         if (tsp == NULL)
325                 return NULL;
326 
327         tsp->smk_task = task;
328         tsp->smk_forked = forked;
329         INIT_LIST_HEAD(&tsp->smk_rules);
330         INIT_LIST_HEAD(&tsp->smk_relabel);
331         mutex_init(&tsp->smk_rules_lock);
332 
333         return tsp;
334 }
335 
336 /**
337  * smk_copy_rules - copy a rule set
338  * @nhead: new rules header pointer
339  * @ohead: old rules header pointer
340  * @gfp: type of the memory for the allocation
341  *
342  * Returns 0 on success, -ENOMEM on error
343  */
344 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
345                                 gfp_t gfp)
346 {
347         struct smack_rule *nrp;
348         struct smack_rule *orp;
349         int rc = 0;
350 
351         list_for_each_entry_rcu(orp, ohead, list) {
352                 nrp = kzalloc(sizeof(struct smack_rule), gfp);
353                 if (nrp == NULL) {
354                         rc = -ENOMEM;
355                         break;
356                 }
357                 *nrp = *orp;
358                 list_add_rcu(&nrp->list, nhead);
359         }
360         return rc;
361 }
362 
363 /**
364  * smk_copy_relabel - copy smk_relabel labels list
365  * @nhead: new rules header pointer
366  * @ohead: old rules header pointer
367  * @gfp: type of the memory for the allocation
368  *
369  * Returns 0 on success, -ENOMEM on error
370  */
371 static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
372                                 gfp_t gfp)
373 {
374         struct smack_known_list_elem *nklep;
375         struct smack_known_list_elem *oklep;
376 
377         list_for_each_entry(oklep, ohead, list) {
378                 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
379                 if (nklep == NULL) {
380                         smk_destroy_label_list(nhead);
381                         return -ENOMEM;
382                 }
383                 nklep->smk_label = oklep->smk_label;
384                 list_add(&nklep->list, nhead);
385         }
386 
387         return 0;
388 }
389 
390 /**
391  * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
392  * @mode - input mode in form of PTRACE_MODE_*
393  *
394  * Returns a converted MAY_* mode usable by smack rules
395  */
396 static inline unsigned int smk_ptrace_mode(unsigned int mode)
397 {
398         if (mode & PTRACE_MODE_ATTACH)
399                 return MAY_READWRITE;
400         if (mode & PTRACE_MODE_READ)
401                 return MAY_READ;
402 
403         return 0;
404 }
405 
406 /**
407  * smk_ptrace_rule_check - helper for ptrace access
408  * @tracer: tracer process
409  * @tracee_known: label entry of the process that's about to be traced
410  * @mode: ptrace attachment mode (PTRACE_MODE_*)
411  * @func: name of the function that called us, used for audit
412  *
413  * Returns 0 on access granted, -error on error
414  */
415 static int smk_ptrace_rule_check(struct task_struct *tracer,
416                                  struct smack_known *tracee_known,
417                                  unsigned int mode, const char *func)
418 {
419         int rc;
420         struct smk_audit_info ad, *saip = NULL;
421         struct task_smack *tsp;
422         struct smack_known *tracer_known;
423 
424         if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
425                 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
426                 smk_ad_setfield_u_tsk(&ad, tracer);
427                 saip = &ad;
428         }
429 
430         rcu_read_lock();
431         tsp = __task_cred(tracer)->security;
432         tracer_known = smk_of_task(tsp);
433 
434         if ((mode & PTRACE_MODE_ATTACH) &&
435             (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
436              smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
437                 if (tracer_known->smk_known == tracee_known->smk_known)
438                         rc = 0;
439                 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
440                         rc = -EACCES;
441                 else if (capable(CAP_SYS_PTRACE))
442                         rc = 0;
443                 else
444                         rc = -EACCES;
445 
446                 if (saip)
447                         smack_log(tracer_known->smk_known,
448                                   tracee_known->smk_known,
449                                   0, rc, saip);
450 
451                 rcu_read_unlock();
452                 return rc;
453         }
454 
455         /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
456         rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
457 
458         rcu_read_unlock();
459         return rc;
460 }
461 
462 /*
463  * LSM hooks.
464  * We he, that is fun!
465  */
466 
467 /**
468  * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
469  * @ctp: child task pointer
470  * @mode: ptrace attachment mode (PTRACE_MODE_*)
471  *
472  * Returns 0 if access is OK, an error code otherwise
473  *
474  * Do the capability checks.
475  */
476 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
477 {
478         struct smack_known *skp;
479 
480         skp = smk_of_task_struct(ctp);
481 
482         return smk_ptrace_rule_check(current, skp, mode, __func__);
483 }
484 
485 /**
486  * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
487  * @ptp: parent task pointer
488  *
489  * Returns 0 if access is OK, an error code otherwise
490  *
491  * Do the capability checks, and require PTRACE_MODE_ATTACH.
492  */
493 static int smack_ptrace_traceme(struct task_struct *ptp)
494 {
495         int rc;
496         struct smack_known *skp;
497 
498         skp = smk_of_task(current_security());
499 
500         rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
501         return rc;
502 }
503 
504 /**
505  * smack_syslog - Smack approval on syslog
506  * @type: message type
507  *
508  * Returns 0 on success, error code otherwise.
509  */
510 static int smack_syslog(int typefrom_file)
511 {
512         int rc = 0;
513         struct smack_known *skp = smk_of_current();
514 
515         if (smack_privileged(CAP_MAC_OVERRIDE))
516                 return 0;
517 
518         if (smack_syslog_label != NULL && smack_syslog_label != skp)
519                 rc = -EACCES;
520 
521         return rc;
522 }
523 
524 
525 /*
526  * Superblock Hooks.
527  */
528 
529 /**
530  * smack_sb_alloc_security - allocate a superblock blob
531  * @sb: the superblock getting the blob
532  *
533  * Returns 0 on success or -ENOMEM on error.
534  */
535 static int smack_sb_alloc_security(struct super_block *sb)
536 {
537         struct superblock_smack *sbsp;
538 
539         sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
540 
541         if (sbsp == NULL)
542                 return -ENOMEM;
543 
544         sbsp->smk_root = &smack_known_floor;
545         sbsp->smk_default = &smack_known_floor;
546         sbsp->smk_floor = &smack_known_floor;
547         sbsp->smk_hat = &smack_known_hat;
548         /*
549          * SMK_SB_INITIALIZED will be zero from kzalloc.
550          */
551         sb->s_security = sbsp;
552 
553         return 0;
554 }
555 
556 /**
557  * smack_sb_free_security - free a superblock blob
558  * @sb: the superblock getting the blob
559  *
560  */
561 static void smack_sb_free_security(struct super_block *sb)
562 {
563         kfree(sb->s_security);
564         sb->s_security = NULL;
565 }
566 
567 /**
568  * smack_sb_copy_data - copy mount options data for processing
569  * @orig: where to start
570  * @smackopts: mount options string
571  *
572  * Returns 0 on success or -ENOMEM on error.
573  *
574  * Copy the Smack specific mount options out of the mount
575  * options list.
576  */
577 static int smack_sb_copy_data(char *orig, char *smackopts)
578 {
579         char *cp, *commap, *otheropts, *dp;
580 
581         otheropts = (char *)get_zeroed_page(GFP_KERNEL);
582         if (otheropts == NULL)
583                 return -ENOMEM;
584 
585         for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
586                 if (strstr(cp, SMK_FSDEFAULT) == cp)
587                         dp = smackopts;
588                 else if (strstr(cp, SMK_FSFLOOR) == cp)
589                         dp = smackopts;
590                 else if (strstr(cp, SMK_FSHAT) == cp)
591                         dp = smackopts;
592                 else if (strstr(cp, SMK_FSROOT) == cp)
593                         dp = smackopts;
594                 else if (strstr(cp, SMK_FSTRANS) == cp)
595                         dp = smackopts;
596                 else
597                         dp = otheropts;
598 
599                 commap = strchr(cp, ',');
600                 if (commap != NULL)
601                         *commap = '\0';
602 
603                 if (*dp != '\0')
604                         strcat(dp, ",");
605                 strcat(dp, cp);
606         }
607 
608         strcpy(orig, otheropts);
609         free_page((unsigned long)otheropts);
610 
611         return 0;
612 }
613 
614 /**
615  * smack_parse_opts_str - parse Smack specific mount options
616  * @options: mount options string
617  * @opts: where to store converted mount opts
618  *
619  * Returns 0 on success or -ENOMEM on error.
620  *
621  * converts Smack specific mount options to generic security option format
622  */
623 static int smack_parse_opts_str(char *options,
624                 struct security_mnt_opts *opts)
625 {
626         char *p;
627         char *fsdefault = NULL;
628         char *fsfloor = NULL;
629         char *fshat = NULL;
630         char *fsroot = NULL;
631         char *fstransmute = NULL;
632         int rc = -ENOMEM;
633         int num_mnt_opts = 0;
634         int token;
635 
636         opts->num_mnt_opts = 0;
637 
638         if (!options)
639                 return 0;
640 
641         while ((p = strsep(&options, ",")) != NULL) {
642                 substring_t args[MAX_OPT_ARGS];
643 
644                 if (!*p)
645                         continue;
646 
647                 token = match_token(p, smk_mount_tokens, args);
648 
649                 switch (token) {
650                 case Opt_fsdefault:
651                         if (fsdefault)
652                                 goto out_opt_err;
653                         fsdefault = match_strdup(&args[0]);
654                         if (!fsdefault)
655                                 goto out_err;
656                         break;
657                 case Opt_fsfloor:
658                         if (fsfloor)
659                                 goto out_opt_err;
660                         fsfloor = match_strdup(&args[0]);
661                         if (!fsfloor)
662                                 goto out_err;
663                         break;
664                 case Opt_fshat:
665                         if (fshat)
666                                 goto out_opt_err;
667                         fshat = match_strdup(&args[0]);
668                         if (!fshat)
669                                 goto out_err;
670                         break;
671                 case Opt_fsroot:
672                         if (fsroot)
673                                 goto out_opt_err;
674                         fsroot = match_strdup(&args[0]);
675                         if (!fsroot)
676                                 goto out_err;
677                         break;
678                 case Opt_fstransmute:
679                         if (fstransmute)
680                                 goto out_opt_err;
681                         fstransmute = match_strdup(&args[0]);
682                         if (!fstransmute)
683                                 goto out_err;
684                         break;
685                 default:
686                         rc = -EINVAL;
687                         pr_warn("Smack:  unknown mount option\n");
688                         goto out_err;
689                 }
690         }
691 
692         opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_KERNEL);
693         if (!opts->mnt_opts)
694                 goto out_err;
695 
696         opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
697                         GFP_KERNEL);
698         if (!opts->mnt_opts_flags)
699                 goto out_err;
700 
701         if (fsdefault) {
702                 opts->mnt_opts[num_mnt_opts] = fsdefault;
703                 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
704         }
705         if (fsfloor) {
706                 opts->mnt_opts[num_mnt_opts] = fsfloor;
707                 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
708         }
709         if (fshat) {
710                 opts->mnt_opts[num_mnt_opts] = fshat;
711                 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
712         }
713         if (fsroot) {
714                 opts->mnt_opts[num_mnt_opts] = fsroot;
715                 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
716         }
717         if (fstransmute) {
718                 opts->mnt_opts[num_mnt_opts] = fstransmute;
719                 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
720         }
721 
722         opts->num_mnt_opts = num_mnt_opts;
723         return 0;
724 
725 out_opt_err:
726         rc = -EINVAL;
727         pr_warn("Smack: duplicate mount options\n");
728 
729 out_err:
730         kfree(fsdefault);
731         kfree(fsfloor);
732         kfree(fshat);
733         kfree(fsroot);
734         kfree(fstransmute);
735         return rc;
736 }
737 
738 /**
739  * smack_set_mnt_opts - set Smack specific mount options
740  * @sb: the file system superblock
741  * @opts: Smack mount options
742  * @kern_flags: mount option from kernel space or user space
743  * @set_kern_flags: where to store converted mount opts
744  *
745  * Returns 0 on success, an error code on failure
746  *
747  * Allow filesystems with binary mount data to explicitly set Smack mount
748  * labels.
749  */
750 static int smack_set_mnt_opts(struct super_block *sb,
751                 struct security_mnt_opts *opts,
752                 unsigned long kern_flags,
753                 unsigned long *set_kern_flags)
754 {
755         struct dentry *root = sb->s_root;
756         struct inode *inode = d_backing_inode(root);
757         struct superblock_smack *sp = sb->s_security;
758         struct inode_smack *isp;
759         struct smack_known *skp;
760         int i;
761         int num_opts = opts->num_mnt_opts;
762         int transmute = 0;
763 
764         if (sp->smk_flags & SMK_SB_INITIALIZED)
765                 return 0;
766 
767         if (!smack_privileged(CAP_MAC_ADMIN)) {
768                 /*
769                  * Unprivileged mounts don't get to specify Smack values.
770                  */
771                 if (num_opts)
772                         return -EPERM;
773                 /*
774                  * Unprivileged mounts get root and default from the caller.
775                  */
776                 skp = smk_of_current();
777                 sp->smk_root = skp;
778                 sp->smk_default = skp;
779                 /*
780                  * For a handful of fs types with no user-controlled
781                  * backing store it's okay to trust security labels
782                  * in the filesystem. The rest are untrusted.
783                  */
784                 if (sb->s_user_ns != &init_user_ns &&
785                     sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
786                     sb->s_magic != RAMFS_MAGIC) {
787                         transmute = 1;
788                         sp->smk_flags |= SMK_SB_UNTRUSTED;
789                 }
790         }
791 
792         sp->smk_flags |= SMK_SB_INITIALIZED;
793 
794         for (i = 0; i < num_opts; i++) {
795                 switch (opts->mnt_opts_flags[i]) {
796                 case FSDEFAULT_MNT:
797                         skp = smk_import_entry(opts->mnt_opts[i], 0);
798                         if (IS_ERR(skp))
799                                 return PTR_ERR(skp);
800                         sp->smk_default = skp;
801                         break;
802                 case FSFLOOR_MNT:
803                         skp = smk_import_entry(opts->mnt_opts[i], 0);
804                         if (IS_ERR(skp))
805                                 return PTR_ERR(skp);
806                         sp->smk_floor = skp;
807                         break;
808                 case FSHAT_MNT:
809                         skp = smk_import_entry(opts->mnt_opts[i], 0);
810                         if (IS_ERR(skp))
811                                 return PTR_ERR(skp);
812                         sp->smk_hat = skp;
813                         break;
814                 case FSROOT_MNT:
815                         skp = smk_import_entry(opts->mnt_opts[i], 0);
816                         if (IS_ERR(skp))
817                                 return PTR_ERR(skp);
818                         sp->smk_root = skp;
819                         break;
820                 case FSTRANS_MNT:
821                         skp = smk_import_entry(opts->mnt_opts[i], 0);
822                         if (IS_ERR(skp))
823                                 return PTR_ERR(skp);
824                         sp->smk_root = skp;
825                         transmute = 1;
826                         break;
827                 default:
828                         break;
829                 }
830         }
831 
832         /*
833          * Initialize the root inode.
834          */
835         isp = inode->i_security;
836         if (isp == NULL) {
837                 isp = new_inode_smack(sp->smk_root);
838                 if (isp == NULL)
839                         return -ENOMEM;
840                 inode->i_security = isp;
841         } else
842                 isp->smk_inode = sp->smk_root;
843 
844         if (transmute)
845                 isp->smk_flags |= SMK_INODE_TRANSMUTE;
846 
847         return 0;
848 }
849 
850 /**
851  * smack_sb_kern_mount - Smack specific mount processing
852  * @sb: the file system superblock
853  * @flags: the mount flags
854  * @data: the smack mount options
855  *
856  * Returns 0 on success, an error code on failure
857  */
858 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
859 {
860         int rc = 0;
861         char *options = data;
862         struct security_mnt_opts opts;
863 
864         security_init_mnt_opts(&opts);
865 
866         if (!options)
867                 goto out;
868 
869         rc = smack_parse_opts_str(options, &opts);
870         if (rc)
871                 goto out_err;
872 
873 out:
874         rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
875 
876 out_err:
877         security_free_mnt_opts(&opts);
878         return rc;
879 }
880 
881 /**
882  * smack_sb_statfs - Smack check on statfs
883  * @dentry: identifies the file system in question
884  *
885  * Returns 0 if current can read the floor of the filesystem,
886  * and error code otherwise
887  */
888 static int smack_sb_statfs(struct dentry *dentry)
889 {
890         struct superblock_smack *sbp = dentry->d_sb->s_security;
891         int rc;
892         struct smk_audit_info ad;
893 
894         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
895         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
896 
897         rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
898         rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
899         return rc;
900 }
901 
902 /*
903  * BPRM hooks
904  */
905 
906 /**
907  * smack_bprm_set_creds - set creds for exec
908  * @bprm: the exec information
909  *
910  * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
911  */
912 static int smack_bprm_set_creds(struct linux_binprm *bprm)
913 {
914         struct inode *inode = file_inode(bprm->file);
915         struct task_smack *bsp = bprm->cred->security;
916         struct inode_smack *isp;
917         struct superblock_smack *sbsp;
918         int rc;
919 
920         if (bprm->called_set_creds)
921                 return 0;
922 
923         isp = inode->i_security;
924         if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
925                 return 0;
926 
927         sbsp = inode->i_sb->s_security;
928         if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
929             isp->smk_task != sbsp->smk_root)
930                 return 0;
931 
932         if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
933                 struct task_struct *tracer;
934                 rc = 0;
935 
936                 rcu_read_lock();
937                 tracer = ptrace_parent(current);
938                 if (likely(tracer != NULL))
939                         rc = smk_ptrace_rule_check(tracer,
940                                                    isp->smk_task,
941                                                    PTRACE_MODE_ATTACH,
942                                                    __func__);
943                 rcu_read_unlock();
944 
945                 if (rc != 0)
946                         return rc;
947         } else if (bprm->unsafe)
948                 return -EPERM;
949 
950         bsp->smk_task = isp->smk_task;
951         bprm->per_clear |= PER_CLEAR_ON_SETID;
952 
953         /* Decide if this is a secure exec. */
954         if (bsp->smk_task != bsp->smk_forked)
955                 bprm->secureexec = 1;
956 
957         return 0;
958 }
959 
960 /*
961  * Inode hooks
962  */
963 
964 /**
965  * smack_inode_alloc_security - allocate an inode blob
966  * @inode: the inode in need of a blob
967  *
968  * Returns 0 if it gets a blob, -ENOMEM otherwise
969  */
970 static int smack_inode_alloc_security(struct inode *inode)
971 {
972         struct smack_known *skp = smk_of_current();
973 
974         inode->i_security = new_inode_smack(skp);
975         if (inode->i_security == NULL)
976                 return -ENOMEM;
977         return 0;
978 }
979 
980 /**
981  * smack_inode_free_rcu - Free inode_smack blob from cache
982  * @head: the rcu_head for getting inode_smack pointer
983  *
984  *  Call back function called from call_rcu() to free
985  *  the i_security blob pointer in inode
986  */
987 static void smack_inode_free_rcu(struct rcu_head *head)
988 {
989         struct inode_smack *issp;
990 
991         issp = container_of(head, struct inode_smack, smk_rcu);
992         kmem_cache_free(smack_inode_cache, issp);
993 }
994 
995 /**
996  * smack_inode_free_security - free an inode blob using call_rcu()
997  * @inode: the inode with a blob
998  *
999  * Clears the blob pointer in inode using RCU
1000  */
1001 static void smack_inode_free_security(struct inode *inode)
1002 {
1003         struct inode_smack *issp = inode->i_security;
1004 
1005         /*
1006          * The inode may still be referenced in a path walk and
1007          * a call to smack_inode_permission() can be made
1008          * after smack_inode_free_security() is called.
1009          * To avoid race condition free the i_security via RCU
1010          * and leave the current inode->i_security pointer intact.
1011          * The inode will be freed after the RCU grace period too.
1012          */
1013         call_rcu(&issp->smk_rcu, smack_inode_free_rcu);
1014 }
1015 
1016 /**
1017  * smack_inode_init_security - copy out the smack from an inode
1018  * @inode: the newly created inode
1019  * @dir: containing directory object
1020  * @qstr: unused
1021  * @name: where to put the attribute name
1022  * @value: where to put the attribute value
1023  * @len: where to put the length of the attribute
1024  *
1025  * Returns 0 if it all works out, -ENOMEM if there's no memory
1026  */
1027 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
1028                                      const struct qstr *qstr, const char **name,
1029                                      void **value, size_t *len)
1030 {
1031         struct inode_smack *issp = inode->i_security;
1032         struct smack_known *skp = smk_of_current();
1033         struct smack_known *isp = smk_of_inode(inode);
1034         struct smack_known *dsp = smk_of_inode(dir);
1035         int may;
1036 
1037         if (name)
1038                 *name = XATTR_SMACK_SUFFIX;
1039 
1040         if (value && len) {
1041                 rcu_read_lock();
1042                 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1043                                        &skp->smk_rules);
1044                 rcu_read_unlock();
1045 
1046                 /*
1047                  * If the access rule allows transmutation and
1048                  * the directory requests transmutation then
1049                  * by all means transmute.
1050                  * Mark the inode as changed.
1051                  */
1052                 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
1053                     smk_inode_transmutable(dir)) {
1054                         isp = dsp;
1055                         issp->smk_flags |= SMK_INODE_CHANGED;
1056                 }
1057 
1058                 *value = kstrdup(isp->smk_known, GFP_NOFS);
1059                 if (*value == NULL)
1060                         return -ENOMEM;
1061 
1062                 *len = strlen(isp->smk_known);
1063         }
1064 
1065         return 0;
1066 }
1067 
1068 /**
1069  * smack_inode_link - Smack check on link
1070  * @old_dentry: the existing object
1071  * @dir: unused
1072  * @new_dentry: the new object
1073  *
1074  * Returns 0 if access is permitted, an error code otherwise
1075  */
1076 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1077                             struct dentry *new_dentry)
1078 {
1079         struct smack_known *isp;
1080         struct smk_audit_info ad;
1081         int rc;
1082 
1083         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1084         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1085 
1086         isp = smk_of_inode(d_backing_inode(old_dentry));
1087         rc = smk_curacc(isp, MAY_WRITE, &ad);
1088         rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1089 
1090         if (rc == 0 && d_is_positive(new_dentry)) {
1091                 isp = smk_of_inode(d_backing_inode(new_dentry));
1092                 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1093                 rc = smk_curacc(isp, MAY_WRITE, &ad);
1094                 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1095         }
1096 
1097         return rc;
1098 }
1099 
1100 /**
1101  * smack_inode_unlink - Smack check on inode deletion
1102  * @dir: containing directory object
1103  * @dentry: file to unlink
1104  *
1105  * Returns 0 if current can write the containing directory
1106  * and the object, error code otherwise
1107  */
1108 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1109 {
1110         struct inode *ip = d_backing_inode(dentry);
1111         struct smk_audit_info ad;
1112         int rc;
1113 
1114         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1115         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1116 
1117         /*
1118          * You need write access to the thing you're unlinking
1119          */
1120         rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1121         rc = smk_bu_inode(ip, MAY_WRITE, rc);
1122         if (rc == 0) {
1123                 /*
1124                  * You also need write access to the containing directory
1125                  */
1126                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1127                 smk_ad_setfield_u_fs_inode(&ad, dir);
1128                 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1129                 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1130         }
1131         return rc;
1132 }
1133 
1134 /**
1135  * smack_inode_rmdir - Smack check on directory deletion
1136  * @dir: containing directory object
1137  * @dentry: directory to unlink
1138  *
1139  * Returns 0 if current can write the containing directory
1140  * and the directory, error code otherwise
1141  */
1142 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1143 {
1144         struct smk_audit_info ad;
1145         int rc;
1146 
1147         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1148         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1149 
1150         /*
1151          * You need write access to the thing you're removing
1152          */
1153         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1154         rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1155         if (rc == 0) {
1156                 /*
1157                  * You also need write access to the containing directory
1158                  */
1159                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1160                 smk_ad_setfield_u_fs_inode(&ad, dir);
1161                 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1162                 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1163         }
1164 
1165         return rc;
1166 }
1167 
1168 /**
1169  * smack_inode_rename - Smack check on rename
1170  * @old_inode: unused
1171  * @old_dentry: the old object
1172  * @new_inode: unused
1173  * @new_dentry: the new object
1174  *
1175  * Read and write access is required on both the old and
1176  * new directories.
1177  *
1178  * Returns 0 if access is permitted, an error code otherwise
1179  */
1180 static int smack_inode_rename(struct inode *old_inode,
1181                               struct dentry *old_dentry,
1182                               struct inode *new_inode,
1183                               struct dentry *new_dentry)
1184 {
1185         int rc;
1186         struct smack_known *isp;
1187         struct smk_audit_info ad;
1188 
1189         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1190         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1191 
1192         isp = smk_of_inode(d_backing_inode(old_dentry));
1193         rc = smk_curacc(isp, MAY_READWRITE, &ad);
1194         rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1195 
1196         if (rc == 0 && d_is_positive(new_dentry)) {
1197                 isp = smk_of_inode(d_backing_inode(new_dentry));
1198                 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1199                 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1200                 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1201         }
1202         return rc;
1203 }
1204 
1205 /**
1206  * smack_inode_permission - Smack version of permission()
1207  * @inode: the inode in question
1208  * @mask: the access requested
1209  *
1210  * This is the important Smack hook.
1211  *
1212  * Returns 0 if access is permitted, -EACCES otherwise
1213  */
1214 static int smack_inode_permission(struct inode *inode, int mask)
1215 {
1216         struct superblock_smack *sbsp = inode->i_sb->s_security;
1217         struct smk_audit_info ad;
1218         int no_block = mask & MAY_NOT_BLOCK;
1219         int rc;
1220 
1221         mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1222         /*
1223          * No permission to check. Existence test. Yup, it's there.
1224          */
1225         if (mask == 0)
1226                 return 0;
1227 
1228         if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
1229                 if (smk_of_inode(inode) != sbsp->smk_root)
1230                         return -EACCES;
1231         }
1232 
1233         /* May be droppable after audit */
1234         if (no_block)
1235                 return -ECHILD;
1236         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1237         smk_ad_setfield_u_fs_inode(&ad, inode);
1238         rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1239         rc = smk_bu_inode(inode, mask, rc);
1240         return rc;
1241 }
1242 
1243 /**
1244  * smack_inode_setattr - Smack check for setting attributes
1245  * @dentry: the object
1246  * @iattr: for the force flag
1247  *
1248  * Returns 0 if access is permitted, an error code otherwise
1249  */
1250 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1251 {
1252         struct smk_audit_info ad;
1253         int rc;
1254 
1255         /*
1256          * Need to allow for clearing the setuid bit.
1257          */
1258         if (iattr->ia_valid & ATTR_FORCE)
1259                 return 0;
1260         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1261         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1262 
1263         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1264         rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1265         return rc;
1266 }
1267 
1268 /**
1269  * smack_inode_getattr - Smack check for getting attributes
1270  * @mnt: vfsmount of the object
1271  * @dentry: the object
1272  *
1273  * Returns 0 if access is permitted, an error code otherwise
1274  */
1275 static int smack_inode_getattr(const struct path *path)
1276 {
1277         struct smk_audit_info ad;
1278         struct inode *inode = d_backing_inode(path->dentry);
1279         int rc;
1280 
1281         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1282         smk_ad_setfield_u_fs_path(&ad, *path);
1283         rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1284         rc = smk_bu_inode(inode, MAY_READ, rc);
1285         return rc;
1286 }
1287 
1288 /**
1289  * smack_inode_setxattr - Smack check for setting xattrs
1290  * @dentry: the object
1291  * @name: name of the attribute
1292  * @value: value of the attribute
1293  * @size: size of the value
1294  * @flags: unused
1295  *
1296  * This protects the Smack attribute explicitly.
1297  *
1298  * Returns 0 if access is permitted, an error code otherwise
1299  */
1300 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1301                                 const void *value, size_t size, int flags)
1302 {
1303         struct smk_audit_info ad;
1304         struct smack_known *skp;
1305         int check_priv = 0;
1306         int check_import = 0;
1307         int check_star = 0;
1308         int rc = 0;
1309 
1310         /*
1311          * Check label validity here so import won't fail in post_setxattr
1312          */
1313         if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1314             strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1315             strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1316                 check_priv = 1;
1317                 check_import = 1;
1318         } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1319                    strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1320                 check_priv = 1;
1321                 check_import = 1;
1322                 check_star = 1;
1323         } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1324                 check_priv = 1;
1325                 if (size != TRANS_TRUE_SIZE ||
1326                     strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1327                         rc = -EINVAL;
1328         } else
1329                 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1330 
1331         if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1332                 rc = -EPERM;
1333 
1334         if (rc == 0 && check_import) {
1335                 skp = size ? smk_import_entry(value, size) : NULL;
1336                 if (IS_ERR(skp))
1337                         rc = PTR_ERR(skp);
1338                 else if (skp == NULL || (check_star &&
1339                     (skp == &smack_known_star || skp == &smack_known_web)))
1340                         rc = -EINVAL;
1341         }
1342 
1343         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1344         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1345 
1346         if (rc == 0) {
1347                 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1348                 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1349         }
1350 
1351         return rc;
1352 }
1353 
1354 /**
1355  * smack_inode_post_setxattr - Apply the Smack update approved above
1356  * @dentry: object
1357  * @name: attribute name
1358  * @value: attribute value
1359  * @size: attribute size
1360  * @flags: unused
1361  *
1362  * Set the pointer in the inode blob to the entry found
1363  * in the master label list.
1364  */
1365 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1366                                       const void *value, size_t size, int flags)
1367 {
1368         struct smack_known *skp;
1369         struct inode_smack *isp = d_backing_inode(dentry)->i_security;
1370 
1371         if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1372                 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1373                 return;
1374         }
1375 
1376         if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1377                 skp = smk_import_entry(value, size);
1378                 if (!IS_ERR(skp))
1379                         isp->smk_inode = skp;
1380         } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1381                 skp = smk_import_entry(value, size);
1382                 if (!IS_ERR(skp))
1383                         isp->smk_task = skp;
1384         } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1385                 skp = smk_import_entry(value, size);
1386                 if (!IS_ERR(skp))
1387                         isp->smk_mmap = skp;
1388         }
1389 
1390         return;
1391 }
1392 
1393 /**
1394  * smack_inode_getxattr - Smack check on getxattr
1395  * @dentry: the object
1396  * @name: unused
1397  *
1398  * Returns 0 if access is permitted, an error code otherwise
1399  */
1400 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1401 {
1402         struct smk_audit_info ad;
1403         int rc;
1404 
1405         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1406         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1407 
1408         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1409         rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1410         return rc;
1411 }
1412 
1413 /**
1414  * smack_inode_removexattr - Smack check on removexattr
1415  * @dentry: the object
1416  * @name: name of the attribute
1417  *
1418  * Removing the Smack attribute requires CAP_MAC_ADMIN
1419  *
1420  * Returns 0 if access is permitted, an error code otherwise
1421  */
1422 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1423 {
1424         struct inode_smack *isp;
1425         struct smk_audit_info ad;
1426         int rc = 0;
1427 
1428         if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1429             strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1430             strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1431             strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1432             strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1433             strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1434                 if (!smack_privileged(CAP_MAC_ADMIN))
1435                         rc = -EPERM;
1436         } else
1437                 rc = cap_inode_removexattr(dentry, name);
1438 
1439         if (rc != 0)
1440                 return rc;
1441 
1442         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1443         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1444 
1445         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1446         rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1447         if (rc != 0)
1448                 return rc;
1449 
1450         isp = d_backing_inode(dentry)->i_security;
1451         /*
1452          * Don't do anything special for these.
1453          *      XATTR_NAME_SMACKIPIN
1454          *      XATTR_NAME_SMACKIPOUT
1455          */
1456         if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1457                 struct super_block *sbp = dentry->d_sb;
1458                 struct superblock_smack *sbsp = sbp->s_security;
1459 
1460                 isp->smk_inode = sbsp->smk_default;
1461         } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
1462                 isp->smk_task = NULL;
1463         else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1464                 isp->smk_mmap = NULL;
1465         else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1466                 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1467 
1468         return 0;
1469 }
1470 
1471 /**
1472  * smack_inode_getsecurity - get smack xattrs
1473  * @inode: the object
1474  * @name: attribute name
1475  * @buffer: where to put the result
1476  * @alloc: duplicate memory
1477  *
1478  * Returns the size of the attribute or an error code
1479  */
1480 static int smack_inode_getsecurity(struct inode *inode,
1481                                    const char *name, void **buffer,
1482                                    bool alloc)
1483 {
1484         struct socket_smack *ssp;
1485         struct socket *sock;
1486         struct super_block *sbp;
1487         struct inode *ip = (struct inode *)inode;
1488         struct smack_known *isp;
1489 
1490         if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
1491                 isp = smk_of_inode(inode);
1492         else {
1493                 /*
1494                  * The rest of the Smack xattrs are only on sockets.
1495                  */
1496                 sbp = ip->i_sb;
1497                 if (sbp->s_magic != SOCKFS_MAGIC)
1498                         return -EOPNOTSUPP;
1499 
1500                 sock = SOCKET_I(ip);
1501                 if (sock == NULL || sock->sk == NULL)
1502                         return -EOPNOTSUPP;
1503 
1504                 ssp = sock->sk->sk_security;
1505 
1506                 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1507                         isp = ssp->smk_in;
1508                 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1509                         isp = ssp->smk_out;
1510                 else
1511                         return -EOPNOTSUPP;
1512         }
1513 
1514         if (alloc) {
1515                 *buffer = kstrdup(isp->smk_known, GFP_KERNEL);
1516                 if (*buffer == NULL)
1517                         return -ENOMEM;
1518         }
1519 
1520         return strlen(isp->smk_known);
1521 }
1522 
1523 
1524 /**
1525  * smack_inode_listsecurity - list the Smack attributes
1526  * @inode: the object
1527  * @buffer: where they go
1528  * @buffer_size: size of buffer
1529  */
1530 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1531                                     size_t buffer_size)
1532 {
1533         int len = sizeof(XATTR_NAME_SMACK);
1534 
1535         if (buffer != NULL && len <= buffer_size)
1536                 memcpy(buffer, XATTR_NAME_SMACK, len);
1537 
1538         return len;
1539 }
1540 
1541 /**
1542  * smack_inode_getsecid - Extract inode's security id
1543  * @inode: inode to extract the info from
1544  * @secid: where result will be saved
1545  */
1546 static void smack_inode_getsecid(struct inode *inode, u32 *secid)
1547 {
1548         struct inode_smack *isp = inode->i_security;
1549 
1550         *secid = isp->smk_inode->smk_secid;
1551 }
1552 
1553 /*
1554  * File Hooks
1555  */
1556 
1557 /*
1558  * There is no smack_file_permission hook
1559  *
1560  * Should access checks be done on each read or write?
1561  * UNICOS and SELinux say yes.
1562  * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1563  *
1564  * I'll say no for now. Smack does not do the frequent
1565  * label changing that SELinux does.
1566  */
1567 
1568 /**
1569  * smack_file_alloc_security - assign a file security blob
1570  * @file: the object
1571  *
1572  * The security blob for a file is a pointer to the master
1573  * label list, so no allocation is done.
1574  *
1575  * f_security is the owner security information. It
1576  * isn't used on file access checks, it's for send_sigio.
1577  *
1578  * Returns 0
1579  */
1580 static int smack_file_alloc_security(struct file *file)
1581 {
1582         struct smack_known *skp = smk_of_current();
1583 
1584         file->f_security = skp;
1585         return 0;
1586 }
1587 
1588 /**
1589  * smack_file_free_security - clear a file security blob
1590  * @file: the object
1591  *
1592  * The security blob for a file is a pointer to the master
1593  * label list, so no memory is freed.
1594  */
1595 static void smack_file_free_security(struct file *file)
1596 {
1597         file->f_security = NULL;
1598 }
1599 
1600 /**
1601  * smack_file_ioctl - Smack check on ioctls
1602  * @file: the object
1603  * @cmd: what to do
1604  * @arg: unused
1605  *
1606  * Relies heavily on the correct use of the ioctl command conventions.
1607  *
1608  * Returns 0 if allowed, error code otherwise
1609  */
1610 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1611                             unsigned long arg)
1612 {
1613         int rc = 0;
1614         struct smk_audit_info ad;
1615         struct inode *inode = file_inode(file);
1616 
1617         if (unlikely(IS_PRIVATE(inode)))
1618                 return 0;
1619 
1620         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1621         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1622 
1623         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1624                 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1625                 rc = smk_bu_file(file, MAY_WRITE, rc);
1626         }
1627 
1628         if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1629                 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1630                 rc = smk_bu_file(file, MAY_READ, rc);
1631         }
1632 
1633         return rc;
1634 }
1635 
1636 /**
1637  * smack_file_lock - Smack check on file locking
1638  * @file: the object
1639  * @cmd: unused
1640  *
1641  * Returns 0 if current has lock access, error code otherwise
1642  */
1643 static int smack_file_lock(struct file *file, unsigned int cmd)
1644 {
1645         struct smk_audit_info ad;
1646         int rc;
1647         struct inode *inode = file_inode(file);
1648 
1649         if (unlikely(IS_PRIVATE(inode)))
1650                 return 0;
1651 
1652         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1653         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1654         rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1655         rc = smk_bu_file(file, MAY_LOCK, rc);
1656         return rc;
1657 }
1658 
1659 /**
1660  * smack_file_fcntl - Smack check on fcntl
1661  * @file: the object
1662  * @cmd: what action to check
1663  * @arg: unused
1664  *
1665  * Generally these operations are harmless.
1666  * File locking operations present an obvious mechanism
1667  * for passing information, so they require write access.
1668  *
1669  * Returns 0 if current has access, error code otherwise
1670  */
1671 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1672                             unsigned long arg)
1673 {
1674         struct smk_audit_info ad;
1675         int rc = 0;
1676         struct inode *inode = file_inode(file);
1677 
1678         if (unlikely(IS_PRIVATE(inode)))
1679                 return 0;
1680 
1681         switch (cmd) {
1682         case F_GETLK:
1683                 break;
1684         case F_SETLK:
1685         case F_SETLKW:
1686                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1687                 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1688                 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1689                 rc = smk_bu_file(file, MAY_LOCK, rc);
1690                 break;
1691         case F_SETOWN:
1692         case F_SETSIG:
1693                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1694                 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1695                 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1696                 rc = smk_bu_file(file, MAY_WRITE, rc);
1697                 break;
1698         default:
1699                 break;
1700         }
1701 
1702         return rc;
1703 }
1704 
1705 /**
1706  * smack_mmap_file :
1707  * Check permissions for a mmap operation.  The @file may be NULL, e.g.
1708  * if mapping anonymous memory.
1709  * @file contains the file structure for file to map (may be NULL).
1710  * @reqprot contains the protection requested by the application.
1711  * @prot contains the protection that will be applied by the kernel.
1712  * @flags contains the operational flags.
1713  * Return 0 if permission is granted.
1714  */
1715 static int smack_mmap_file(struct file *file,
1716                            unsigned long reqprot, unsigned long prot,
1717                            unsigned long flags)
1718 {
1719         struct smack_known *skp;
1720         struct smack_known *mkp;
1721         struct smack_rule *srp;
1722         struct task_smack *tsp;
1723         struct smack_known *okp;
1724         struct inode_smack *isp;
1725         struct superblock_smack *sbsp;
1726         int may;
1727         int mmay;
1728         int tmay;
1729         int rc;
1730 
1731         if (file == NULL)
1732                 return 0;
1733 
1734         if (unlikely(IS_PRIVATE(file_inode(file))))
1735                 return 0;
1736 
1737         isp = file_inode(file)->i_security;
1738         if (isp->smk_mmap == NULL)
1739                 return 0;
1740         sbsp = file_inode(file)->i_sb->s_security;
1741         if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
1742             isp->smk_mmap != sbsp->smk_root)
1743                 return -EACCES;
1744         mkp = isp->smk_mmap;
1745 
1746         tsp = current_security();
1747         skp = smk_of_current();
1748         rc = 0;
1749 
1750         rcu_read_lock();
1751         /*
1752          * For each Smack rule associated with the subject
1753          * label verify that the SMACK64MMAP also has access
1754          * to that rule's object label.
1755          */
1756         list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1757                 okp = srp->smk_object;
1758                 /*
1759                  * Matching labels always allows access.
1760                  */
1761                 if (mkp->smk_known == okp->smk_known)
1762                         continue;
1763                 /*
1764                  * If there is a matching local rule take
1765                  * that into account as well.
1766                  */
1767                 may = smk_access_entry(srp->smk_subject->smk_known,
1768                                        okp->smk_known,
1769                                        &tsp->smk_rules);
1770                 if (may == -ENOENT)
1771                         may = srp->smk_access;
1772                 else
1773                         may &= srp->smk_access;
1774                 /*
1775                  * If may is zero the SMACK64MMAP subject can't
1776                  * possibly have less access.
1777                  */
1778                 if (may == 0)
1779                         continue;
1780 
1781                 /*
1782                  * Fetch the global list entry.
1783                  * If there isn't one a SMACK64MMAP subject
1784                  * can't have as much access as current.
1785                  */
1786                 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1787                                         &mkp->smk_rules);
1788                 if (mmay == -ENOENT) {
1789                         rc = -EACCES;
1790                         break;
1791                 }
1792                 /*
1793                  * If there is a local entry it modifies the
1794                  * potential access, too.
1795                  */
1796                 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1797                                         &tsp->smk_rules);
1798                 if (tmay != -ENOENT)
1799                         mmay &= tmay;
1800 
1801                 /*
1802                  * If there is any access available to current that is
1803                  * not available to a SMACK64MMAP subject
1804                  * deny access.
1805                  */
1806                 if ((may | mmay) != mmay) {
1807                         rc = -EACCES;
1808                         break;
1809                 }
1810         }
1811 
1812         rcu_read_unlock();
1813 
1814         return rc;
1815 }
1816 
1817 /**
1818  * smack_file_set_fowner - set the file security blob value
1819  * @file: object in question
1820  *
1821  */
1822 static void smack_file_set_fowner(struct file *file)
1823 {
1824         file->f_security = smk_of_current();
1825 }
1826 
1827 /**
1828  * smack_file_send_sigiotask - Smack on sigio
1829  * @tsk: The target task
1830  * @fown: the object the signal come from
1831  * @signum: unused
1832  *
1833  * Allow a privileged task to get signals even if it shouldn't
1834  *
1835  * Returns 0 if a subject with the object's smack could
1836  * write to the task, an error code otherwise.
1837  */
1838 static int smack_file_send_sigiotask(struct task_struct *tsk,
1839                                      struct fown_struct *fown, int signum)
1840 {
1841         struct smack_known *skp;
1842         struct smack_known *tkp = smk_of_task(tsk->cred->security);
1843         struct file *file;
1844         int rc;
1845         struct smk_audit_info ad;
1846 
1847         /*
1848          * struct fown_struct is never outside the context of a struct file
1849          */
1850         file = container_of(fown, struct file, f_owner);
1851 
1852         /* we don't log here as rc can be overriden */
1853         skp = file->f_security;
1854         rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
1855         rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
1856         if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1857                 rc = 0;
1858 
1859         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1860         smk_ad_setfield_u_tsk(&ad, tsk);
1861         smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
1862         return rc;
1863 }
1864 
1865 /**
1866  * smack_file_receive - Smack file receive check
1867  * @file: the object
1868  *
1869  * Returns 0 if current has access, error code otherwise
1870  */
1871 static int smack_file_receive(struct file *file)
1872 {
1873         int rc;
1874         int may = 0;
1875         struct smk_audit_info ad;
1876         struct inode *inode = file_inode(file);
1877         struct socket *sock;
1878         struct task_smack *tsp;
1879         struct socket_smack *ssp;
1880 
1881         if (unlikely(IS_PRIVATE(inode)))
1882                 return 0;
1883 
1884         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1885         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1886 
1887         if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
1888                 sock = SOCKET_I(inode);
1889                 ssp = sock->sk->sk_security;
1890                 tsp = current_security();
1891                 /*
1892                  * If the receiving process can't write to the
1893                  * passed socket or if the passed socket can't
1894                  * write to the receiving process don't accept
1895                  * the passed socket.
1896                  */
1897                 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1898                 rc = smk_bu_file(file, may, rc);
1899                 if (rc < 0)
1900                         return rc;
1901                 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1902                 rc = smk_bu_file(file, may, rc);
1903                 return rc;
1904         }
1905         /*
1906          * This code relies on bitmasks.
1907          */
1908         if (file->f_mode & FMODE_READ)
1909                 may = MAY_READ;
1910         if (file->f_mode & FMODE_WRITE)
1911                 may |= MAY_WRITE;
1912 
1913         rc = smk_curacc(smk_of_inode(inode), may, &ad);
1914         rc = smk_bu_file(file, may, rc);
1915         return rc;
1916 }
1917 
1918 /**
1919  * smack_file_open - Smack dentry open processing
1920  * @file: the object
1921  * @cred: task credential
1922  *
1923  * Set the security blob in the file structure.
1924  * Allow the open only if the task has read access. There are
1925  * many read operations (e.g. fstat) that you can do with an
1926  * fd even if you have the file open write-only.
1927  *
1928  * Returns 0
1929  */
1930 static int smack_file_open(struct file *file, const struct cred *cred)
1931 {
1932         struct task_smack *tsp = cred->security;
1933         struct inode *inode = file_inode(file);
1934         struct smk_audit_info ad;
1935         int rc;
1936 
1937         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1938         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1939         rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
1940         rc = smk_bu_credfile(cred, file, MAY_READ, rc);
1941 
1942         return rc;
1943 }
1944 
1945 /*
1946  * Task hooks
1947  */
1948 
1949 /**
1950  * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1951  * @new: the new credentials
1952  * @gfp: the atomicity of any memory allocations
1953  *
1954  * Prepare a blank set of credentials for modification.  This must allocate all
1955  * the memory the LSM module might require such that cred_transfer() can
1956  * complete without error.
1957  */
1958 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1959 {
1960         struct task_smack *tsp;
1961 
1962         tsp = new_task_smack(NULL, NULL, gfp);
1963         if (tsp == NULL)
1964                 return -ENOMEM;
1965 
1966         cred->security = tsp;
1967 
1968         return 0;
1969 }
1970 
1971 
1972 /**
1973  * smack_cred_free - "free" task-level security credentials
1974  * @cred: the credentials in question
1975  *
1976  */
1977 static void smack_cred_free(struct cred *cred)
1978 {
1979         struct task_smack *tsp = cred->security;
1980         struct smack_rule *rp;
1981         struct list_head *l;
1982         struct list_head *n;
1983 
1984         if (tsp == NULL)
1985                 return;
1986         cred->security = NULL;
1987 
1988         smk_destroy_label_list(&tsp->smk_relabel);
1989 
1990         list_for_each_safe(l, n, &tsp->smk_rules) {
1991                 rp = list_entry(l, struct smack_rule, list);
1992                 list_del(&rp->list);
1993                 kfree(rp);
1994         }
1995         kfree(tsp);
1996 }
1997 
1998 /**
1999  * smack_cred_prepare - prepare new set of credentials for modification
2000  * @new: the new credentials
2001  * @old: the original credentials
2002  * @gfp: the atomicity of any memory allocations
2003  *
2004  * Prepare a new set of credentials for modification.
2005  */
2006 static int smack_cred_prepare(struct cred *new, const struct cred *old,
2007                               gfp_t gfp)
2008 {
2009         struct task_smack *old_tsp = old->security;
2010         struct task_smack *new_tsp;
2011         int rc;
2012 
2013         new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
2014         if (new_tsp == NULL)
2015                 return -ENOMEM;
2016 
2017         new->security = new_tsp;
2018 
2019         rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
2020         if (rc != 0)
2021                 return rc;
2022 
2023         rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2024                                 gfp);
2025         if (rc != 0)
2026                 return rc;
2027 
2028         return 0;
2029 }
2030 
2031 /**
2032  * smack_cred_transfer - Transfer the old credentials to the new credentials
2033  * @new: the new credentials
2034  * @old: the original credentials
2035  *
2036  * Fill in a set of blank credentials from another set of credentials.
2037  */
2038 static void smack_cred_transfer(struct cred *new, const struct cred *old)
2039 {
2040         struct task_smack *old_tsp = old->security;
2041         struct task_smack *new_tsp = new->security;
2042 
2043         new_tsp->smk_task = old_tsp->smk_task;
2044         new_tsp->smk_forked = old_tsp->smk_task;
2045         mutex_init(&new_tsp->smk_rules_lock);
2046         INIT_LIST_HEAD(&new_tsp->smk_rules);
2047 
2048 
2049         /* cbs copy rule list */
2050 }
2051 
2052 /**
2053  * smack_kernel_act_as - Set the subjective context in a set of credentials
2054  * @new: points to the set of credentials to be modified.
2055  * @secid: specifies the security ID to be set
2056  *
2057  * Set the security data for a kernel service.
2058  */
2059 static int smack_kernel_act_as(struct cred *new, u32 secid)
2060 {
2061         struct task_smack *new_tsp = new->security;
2062 
2063         new_tsp->smk_task = smack_from_secid(secid);
2064         return 0;
2065 }
2066 
2067 /**
2068  * smack_kernel_create_files_as - Set the file creation label in a set of creds
2069  * @new: points to the set of credentials to be modified
2070  * @inode: points to the inode to use as a reference
2071  *
2072  * Set the file creation context in a set of credentials to the same
2073  * as the objective context of the specified inode
2074  */
2075 static int smack_kernel_create_files_as(struct cred *new,
2076                                         struct inode *inode)
2077 {
2078         struct inode_smack *isp = inode->i_security;
2079         struct task_smack *tsp = new->security;
2080 
2081         tsp->smk_forked = isp->smk_inode;
2082         tsp->smk_task = tsp->smk_forked;
2083         return 0;
2084 }
2085 
2086 /**
2087  * smk_curacc_on_task - helper to log task related access
2088  * @p: the task object
2089  * @access: the access requested
2090  * @caller: name of the calling function for audit
2091  *
2092  * Return 0 if access is permitted
2093  */
2094 static int smk_curacc_on_task(struct task_struct *p, int access,
2095                                 const char *caller)
2096 {
2097         struct smk_audit_info ad;
2098         struct smack_known *skp = smk_of_task_struct(p);
2099         int rc;
2100 
2101         smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2102         smk_ad_setfield_u_tsk(&ad, p);
2103         rc = smk_curacc(skp, access, &ad);
2104         rc = smk_bu_task(p, access, rc);
2105         return rc;
2106 }
2107 
2108 /**
2109  * smack_task_setpgid - Smack check on setting pgid
2110  * @p: the task object
2111  * @pgid: unused
2112  *
2113  * Return 0 if write access is permitted
2114  */
2115 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2116 {
2117         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2118 }
2119 
2120 /**
2121  * smack_task_getpgid - Smack access check for getpgid
2122  * @p: the object task
2123  *
2124  * Returns 0 if current can read the object task, error code otherwise
2125  */
2126 static int smack_task_getpgid(struct task_struct *p)
2127 {
2128         return smk_curacc_on_task(p, MAY_READ, __func__);
2129 }
2130 
2131 /**
2132  * smack_task_getsid - Smack access check for getsid
2133  * @p: the object task
2134  *
2135  * Returns 0 if current can read the object task, error code otherwise
2136  */
2137 static int smack_task_getsid(struct task_struct *p)
2138 {
2139         return smk_curacc_on_task(p, MAY_READ, __func__);
2140 }
2141 
2142 /**
2143  * smack_task_getsecid - get the secid of the task
2144  * @p: the object task
2145  * @secid: where to put the result
2146  *
2147  * Sets the secid to contain a u32 version of the smack label.
2148  */
2149 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2150 {
2151         struct smack_known *skp = smk_of_task_struct(p);
2152 
2153         *secid = skp->smk_secid;
2154 }
2155 
2156 /**
2157  * smack_task_setnice - Smack check on setting nice
2158  * @p: the task object
2159  * @nice: unused
2160  *
2161  * Return 0 if write access is permitted
2162  */
2163 static int smack_task_setnice(struct task_struct *p, int nice)
2164 {
2165         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2166 }
2167 
2168 /**
2169  * smack_task_setioprio - Smack check on setting ioprio
2170  * @p: the task object
2171  * @ioprio: unused
2172  *
2173  * Return 0 if write access is permitted
2174  */
2175 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2176 {
2177         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2178 }
2179 
2180 /**
2181  * smack_task_getioprio - Smack check on reading ioprio
2182  * @p: the task object
2183  *
2184  * Return 0 if read access is permitted
2185  */
2186 static int smack_task_getioprio(struct task_struct *p)
2187 {
2188         return smk_curacc_on_task(p, MAY_READ, __func__);
2189 }
2190 
2191 /**
2192  * smack_task_setscheduler - Smack check on setting scheduler
2193  * @p: the task object
2194  * @policy: unused
2195  * @lp: unused
2196  *
2197  * Return 0 if read access is permitted
2198  */
2199 static int smack_task_setscheduler(struct task_struct *p)
2200 {
2201         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2202 }
2203 
2204 /**
2205  * smack_task_getscheduler - Smack check on reading scheduler
2206  * @p: the task object
2207  *
2208  * Return 0 if read access is permitted
2209  */
2210 static int smack_task_getscheduler(struct task_struct *p)
2211 {
2212         return smk_curacc_on_task(p, MAY_READ, __func__);
2213 }
2214 
2215 /**
2216  * smack_task_movememory - Smack check on moving memory
2217  * @p: the task object
2218  *
2219  * Return 0 if write access is permitted
2220  */
2221 static int smack_task_movememory(struct task_struct *p)
2222 {
2223         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2224 }
2225 
2226 /**
2227  * smack_task_kill - Smack check on signal delivery
2228  * @p: the task object
2229  * @info: unused
2230  * @sig: unused
2231  * @secid: identifies the smack to use in lieu of current's
2232  *
2233  * Return 0 if write access is permitted
2234  *
2235  * The secid behavior is an artifact of an SELinux hack
2236  * in the USB code. Someday it may go away.
2237  */
2238 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2239                            int sig, u32 secid)
2240 {
2241         struct smk_audit_info ad;
2242         struct smack_known *skp;
2243         struct smack_known *tkp = smk_of_task_struct(p);
2244         int rc;
2245 
2246         if (!sig)
2247                 return 0; /* null signal; existence test */
2248 
2249         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2250         smk_ad_setfield_u_tsk(&ad, p);
2251         /*
2252          * Sending a signal requires that the sender
2253          * can write the receiver.
2254          */
2255         if (secid == 0) {
2256                 rc = smk_curacc(tkp, MAY_DELIVER, &ad);
2257                 rc = smk_bu_task(p, MAY_DELIVER, rc);
2258                 return rc;
2259         }
2260         /*
2261          * If the secid isn't 0 we're dealing with some USB IO
2262          * specific behavior. This is not clean. For one thing
2263          * we can't take privilege into account.
2264          */
2265         skp = smack_from_secid(secid);
2266         rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
2267         rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
2268         return rc;
2269 }
2270 
2271 /**
2272  * smack_task_to_inode - copy task smack into the inode blob
2273  * @p: task to copy from
2274  * @inode: inode to copy to
2275  *
2276  * Sets the smack pointer in the inode security blob
2277  */
2278 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2279 {
2280         struct inode_smack *isp = inode->i_security;
2281         struct smack_known *skp = smk_of_task_struct(p);
2282 
2283         isp->smk_inode = skp;
2284 }
2285 
2286 /*
2287  * Socket hooks.
2288  */
2289 
2290 /**
2291  * smack_sk_alloc_security - Allocate a socket blob
2292  * @sk: the socket
2293  * @family: unused
2294  * @gfp_flags: memory allocation flags
2295  *
2296  * Assign Smack pointers to current
2297  *
2298  * Returns 0 on success, -ENOMEM is there's no memory
2299  */
2300 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2301 {
2302         struct smack_known *skp = smk_of_current();
2303         struct socket_smack *ssp;
2304 
2305         ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2306         if (ssp == NULL)
2307                 return -ENOMEM;
2308 
2309         /*
2310          * Sockets created by kernel threads receive web label.
2311          */
2312         if (unlikely(current->flags & PF_KTHREAD)) {
2313                 ssp->smk_in = &smack_known_web;
2314                 ssp->smk_out = &smack_known_web;
2315         } else {
2316                 ssp->smk_in = skp;
2317                 ssp->smk_out = skp;
2318         }
2319         ssp->smk_packet = NULL;
2320 
2321         sk->sk_security = ssp;
2322 
2323         return 0;
2324 }
2325 
2326 /**
2327  * smack_sk_free_security - Free a socket blob
2328  * @sk: the socket
2329  *
2330  * Clears the blob pointer
2331  */
2332 static void smack_sk_free_security(struct sock *sk)
2333 {
2334 #ifdef SMACK_IPV6_PORT_LABELING
2335         struct smk_port_label *spp;
2336 
2337         if (sk->sk_family == PF_INET6) {
2338                 rcu_read_lock();
2339                 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2340                         if (spp->smk_sock != sk)
2341                                 continue;
2342                         spp->smk_can_reuse = 1;
2343                         break;
2344                 }
2345                 rcu_read_unlock();
2346         }
2347 #endif
2348         kfree(sk->sk_security);
2349 }
2350 
2351 /**
2352 * smack_ipv4host_label - check host based restrictions
2353 * @sip: the object end
2354 *
2355 * looks for host based access restrictions
2356 *
2357 * This version will only be appropriate for really small sets of single label
2358 * hosts.  The caller is responsible for ensuring that the RCU read lock is
2359 * taken before calling this function.
2360 *
2361 * Returns the label of the far end or NULL if it's not special.
2362 */
2363 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2364 {
2365         struct smk_net4addr *snp;
2366         struct in_addr *siap = &sip->sin_addr;
2367 
2368         if (siap->s_addr == 0)
2369                 return NULL;
2370 
2371         list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2372                 /*
2373                  * we break after finding the first match because
2374                  * the list is sorted from longest to shortest mask
2375                  * so we have found the most specific match
2376                  */
2377                 if (snp->smk_host.s_addr ==
2378                     (siap->s_addr & snp->smk_mask.s_addr))
2379                         return snp->smk_label;
2380 
2381         return NULL;
2382 }
2383 
2384 #if IS_ENABLED(CONFIG_IPV6)
2385 /*
2386  * smk_ipv6_localhost - Check for local ipv6 host address
2387  * @sip: the address
2388  *
2389  * Returns boolean true if this is the localhost address
2390  */
2391 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2392 {
2393         __be16 *be16p = (__be16 *)&sip->sin6_addr;
2394         __be32 *be32p = (__be32 *)&sip->sin6_addr;
2395 
2396         if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2397             ntohs(be16p[7]) == 1)
2398                 return true;
2399         return false;
2400 }
2401 
2402 /**
2403 * smack_ipv6host_label - check host based restrictions
2404 * @sip: the object end
2405 *
2406 * looks for host based access restrictions
2407 *
2408 * This version will only be appropriate for really small sets of single label
2409 * hosts.  The caller is responsible for ensuring that the RCU read lock is
2410 * taken before calling this function.
2411 *
2412 * Returns the label of the far end or NULL if it's not special.
2413 */
2414 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2415 {
2416         struct smk_net6addr *snp;
2417         struct in6_addr *sap = &sip->sin6_addr;
2418         int i;
2419         int found = 0;
2420 
2421         /*
2422          * It's local. Don't look for a host label.
2423          */
2424         if (smk_ipv6_localhost(sip))
2425                 return NULL;
2426 
2427         list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2428                 /*
2429                  * If the label is NULL the entry has
2430                  * been renounced. Ignore it.
2431                  */
2432                 if (snp->smk_label == NULL)
2433                         continue;
2434                 /*
2435                 * we break after finding the first match because
2436                 * the list is sorted from longest to shortest mask
2437                 * so we have found the most specific match
2438                 */
2439                 for (found = 1, i = 0; i < 8; i++) {
2440                         if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2441                             snp->smk_host.s6_addr16[i]) {
2442                                 found = 0;
2443                                 break;
2444                         }
2445                 }
2446                 if (found)
2447                         return snp->smk_label;
2448         }
2449 
2450         return NULL;
2451 }
2452 #endif /* CONFIG_IPV6 */
2453 
2454 /**
2455  * smack_netlabel - Set the secattr on a socket
2456  * @sk: the socket
2457  * @labeled: socket label scheme
2458  *
2459  * Convert the outbound smack value (smk_out) to a
2460  * secattr and attach it to the socket.
2461  *
2462  * Returns 0 on success or an error code
2463  */
2464 static int smack_netlabel(struct sock *sk, int labeled)
2465 {
2466         struct smack_known *skp;
2467         struct socket_smack *ssp = sk->sk_security;
2468         int rc = 0;
2469 
2470         /*
2471          * Usually the netlabel code will handle changing the
2472          * packet labeling based on the label.
2473          * The case of a single label host is different, because
2474          * a single label host should never get a labeled packet
2475          * even though the label is usually associated with a packet
2476          * label.
2477          */
2478         local_bh_disable();
2479         bh_lock_sock_nested(sk);
2480 
2481         if (ssp->smk_out == smack_net_ambient ||
2482             labeled == SMACK_UNLABELED_SOCKET)
2483                 netlbl_sock_delattr(sk);
2484         else {
2485                 skp = ssp->smk_out;
2486                 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2487         }
2488 
2489         bh_unlock_sock(sk);
2490         local_bh_enable();
2491 
2492         return rc;
2493 }
2494 
2495 /**
2496  * smack_netlbel_send - Set the secattr on a socket and perform access checks
2497  * @sk: the socket
2498  * @sap: the destination address
2499  *
2500  * Set the correct secattr for the given socket based on the destination
2501  * address and perform any outbound access checks needed.
2502  *
2503  * Returns 0 on success or an error code.
2504  *
2505  */
2506 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2507 {
2508         struct smack_known *skp;
2509         int rc;
2510         int sk_lbl;
2511         struct smack_known *hkp;
2512         struct socket_smack *ssp = sk->sk_security;
2513         struct smk_audit_info ad;
2514 
2515         rcu_read_lock();
2516         hkp = smack_ipv4host_label(sap);
2517         if (hkp != NULL) {
2518 #ifdef CONFIG_AUDIT
2519                 struct lsm_network_audit net;
2520 
2521                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2522                 ad.a.u.net->family = sap->sin_family;
2523                 ad.a.u.net->dport = sap->sin_port;
2524                 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2525 #endif
2526                 sk_lbl = SMACK_UNLABELED_SOCKET;
2527                 skp = ssp->smk_out;
2528                 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2529                 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2530         } else {
2531                 sk_lbl = SMACK_CIPSO_SOCKET;
2532                 rc = 0;
2533         }
2534         rcu_read_unlock();
2535         if (rc != 0)
2536                 return rc;
2537 
2538         return smack_netlabel(sk, sk_lbl);
2539 }
2540 
2541 #if IS_ENABLED(CONFIG_IPV6)
2542 /**
2543  * smk_ipv6_check - check Smack access
2544  * @subject: subject Smack label
2545  * @object: object Smack label
2546  * @address: address
2547  * @act: the action being taken
2548  *
2549  * Check an IPv6 access
2550  */
2551 static int smk_ipv6_check(struct smack_known *subject,
2552                                 struct smack_known *object,
2553                                 struct sockaddr_in6 *address, int act)
2554 {
2555 #ifdef CONFIG_AUDIT
2556         struct lsm_network_audit net;
2557 #endif
2558         struct smk_audit_info ad;
2559         int rc;
2560 
2561 #ifdef CONFIG_AUDIT
2562         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2563         ad.a.u.net->family = PF_INET6;
2564         ad.a.u.net->dport = ntohs(address->sin6_port);
2565         if (act == SMK_RECEIVING)
2566                 ad.a.u.net->v6info.saddr = address->sin6_addr;
2567         else
2568                 ad.a.u.net->v6info.daddr = address->sin6_addr;
2569 #endif
2570         rc = smk_access(subject, object, MAY_WRITE, &ad);
2571         rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2572         return rc;
2573 }
2574 #endif /* CONFIG_IPV6 */
2575 
2576 #ifdef SMACK_IPV6_PORT_LABELING
2577 /**
2578  * smk_ipv6_port_label - Smack port access table management
2579  * @sock: socket
2580  * @address: address
2581  *
2582  * Create or update the port list entry
2583  */
2584 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2585 {
2586         struct sock *sk = sock->sk;
2587         struct sockaddr_in6 *addr6;
2588         struct socket_smack *ssp = sock->sk->sk_security;
2589         struct smk_port_label *spp;
2590         unsigned short port = 0;
2591 
2592         if (address == NULL) {
2593                 /*
2594                  * This operation is changing the Smack information
2595                  * on the bound socket. Take the changes to the port
2596                  * as well.
2597                  */
2598                 rcu_read_lock();
2599                 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2600                         if (sk != spp->smk_sock)
2601                                 continue;
2602                         spp->smk_in = ssp->smk_in;
2603                         spp->smk_out = ssp->smk_out;
2604                         rcu_read_unlock();
2605                         return;
2606                 }
2607                 /*
2608                  * A NULL address is only used for updating existing
2609                  * bound entries. If there isn't one, it's OK.
2610                  */
2611                 rcu_read_unlock();
2612                 return;
2613         }
2614 
2615         addr6 = (struct sockaddr_in6 *)address;
2616         port = ntohs(addr6->sin6_port);
2617         /*
2618          * This is a special case that is safely ignored.
2619          */
2620         if (port == 0)
2621                 return;
2622 
2623         /*
2624          * Look for an existing port list entry.
2625          * This is an indication that a port is getting reused.
2626          */
2627         rcu_read_lock();
2628         list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2629                 if (spp->smk_port != port || spp->smk_sock_type != sock->type)
2630                         continue;
2631                 if (spp->smk_can_reuse != 1) {
2632                         rcu_read_unlock();
2633                         return;
2634                 }
2635                 spp->smk_port = port;
2636                 spp->smk_sock = sk;
2637                 spp->smk_in = ssp->smk_in;
2638                 spp->smk_out = ssp->smk_out;
2639                 spp->smk_can_reuse = 0;
2640                 rcu_read_unlock();
2641                 return;
2642         }
2643         rcu_read_unlock();
2644         /*
2645          * A new port entry is required.
2646          */
2647         spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2648         if (spp == NULL)
2649                 return;
2650 
2651         spp->smk_port = port;
2652         spp->smk_sock = sk;
2653         spp->smk_in = ssp->smk_in;
2654         spp->smk_out = ssp->smk_out;
2655         spp->smk_sock_type = sock->type;
2656         spp->smk_can_reuse = 0;
2657 
2658         mutex_lock(&smack_ipv6_lock);
2659         list_add_rcu(&spp->list, &smk_ipv6_port_list);
2660         mutex_unlock(&smack_ipv6_lock);
2661         return;
2662 }
2663 
2664 /**
2665  * smk_ipv6_port_check - check Smack port access
2666  * @sock: socket
2667  * @address: address
2668  *
2669  * Create or update the port list entry
2670  */
2671 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2672                                 int act)
2673 {
2674         struct smk_port_label *spp;
2675         struct socket_smack *ssp = sk->sk_security;
2676         struct smack_known *skp = NULL;
2677         unsigned short port;
2678         struct smack_known *object;
2679 
2680         if (act == SMK_RECEIVING) {
2681                 skp = smack_ipv6host_label(address);
2682                 object = ssp->smk_in;
2683         } else {
2684                 skp = ssp->smk_out;
2685                 object = smack_ipv6host_label(address);
2686         }
2687 
2688         /*
2689          * The other end is a single label host.
2690          */
2691         if (skp != NULL && object != NULL)
2692                 return smk_ipv6_check(skp, object, address, act);
2693         if (skp == NULL)
2694                 skp = smack_net_ambient;
2695         if (object == NULL)
2696                 object = smack_net_ambient;
2697 
2698         /*
2699          * It's remote, so port lookup does no good.
2700          */
2701         if (!smk_ipv6_localhost(address))
2702                 return smk_ipv6_check(skp, object, address, act);
2703 
2704         /*
2705          * It's local so the send check has to have passed.
2706          */
2707         if (act == SMK_RECEIVING)
2708                 return 0;
2709 
2710         port = ntohs(address->sin6_port);
2711         rcu_read_lock();
2712         list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2713                 if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
2714                         continue;
2715                 object = spp->smk_in;
2716                 if (act == SMK_CONNECTING)
2717                         ssp->smk_packet = spp->smk_out;
2718                 break;
2719         }
2720         rcu_read_unlock();
2721 
2722         return smk_ipv6_check(skp, object, address, act);
2723 }
2724 #endif /* SMACK_IPV6_PORT_LABELING */
2725 
2726 /**
2727  * smack_inode_setsecurity - set smack xattrs
2728  * @inode: the object
2729  * @name: attribute name
2730  * @value: attribute value
2731  * @size: size of the attribute
2732  * @flags: unused
2733  *
2734  * Sets the named attribute in the appropriate blob
2735  *
2736  * Returns 0 on success, or an error code
2737  */
2738 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2739                                    const void *value, size_t size, int flags)
2740 {
2741         struct smack_known *skp;
2742         struct inode_smack *nsp = inode->i_security;
2743         struct socket_smack *ssp;
2744         struct socket *sock;
2745         int rc = 0;
2746 
2747         if (value == NULL || size > SMK_LONGLABEL || size == 0)
2748                 return -EINVAL;
2749 
2750         skp = smk_import_entry(value, size);
2751         if (IS_ERR(skp))
2752                 return PTR_ERR(skp);
2753 
2754         if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2755                 nsp->smk_inode = skp;
2756                 nsp->smk_flags |= SMK_INODE_INSTANT;
2757                 return 0;
2758         }
2759         /*
2760          * The rest of the Smack xattrs are only on sockets.
2761          */
2762         if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2763                 return -EOPNOTSUPP;
2764 
2765         sock = SOCKET_I(inode);
2766         if (sock == NULL || sock->sk == NULL)
2767                 return -EOPNOTSUPP;
2768 
2769         ssp = sock->sk->sk_security;
2770 
2771         if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2772                 ssp->smk_in = skp;
2773         else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2774                 ssp->smk_out = skp;
2775                 if (sock->sk->sk_family == PF_INET) {
2776                         rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2777                         if (rc != 0)
2778                                 printk(KERN_WARNING
2779                                         "Smack: \"%s\" netlbl error %d.\n",
2780                                         __func__, -rc);
2781                 }
2782         } else
2783                 return -EOPNOTSUPP;
2784 
2785 #ifdef SMACK_IPV6_PORT_LABELING
2786         if (sock->sk->sk_family == PF_INET6)
2787                 smk_ipv6_port_label(sock, NULL);
2788 #endif
2789 
2790         return 0;
2791 }
2792 
2793 /**
2794  * smack_socket_post_create - finish socket setup
2795  * @sock: the socket
2796  * @family: protocol family
2797  * @type: unused
2798  * @protocol: unused
2799  * @kern: unused
2800  *
2801  * Sets the netlabel information on the socket
2802  *
2803  * Returns 0 on success, and error code otherwise
2804  */
2805 static int smack_socket_post_create(struct socket *sock, int family,
2806                                     int type, int protocol, int kern)
2807 {
2808         struct socket_smack *ssp;
2809 
2810         if (sock->sk == NULL)
2811                 return 0;
2812 
2813         /*
2814          * Sockets created by kernel threads receive web label.
2815          */
2816         if (unlikely(current->flags & PF_KTHREAD)) {
2817                 ssp = sock->sk->sk_security;
2818                 ssp->smk_in = &smack_known_web;
2819                 ssp->smk_out = &smack_known_web;
2820         }
2821 
2822         if (family != PF_INET)
2823                 return 0;
2824         /*
2825          * Set the outbound netlbl.
2826          */
2827         return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2828 }
2829 
2830 #ifdef SMACK_IPV6_PORT_LABELING
2831 /**
2832  * smack_socket_bind - record port binding information.
2833  * @sock: the socket
2834  * @address: the port address
2835  * @addrlen: size of the address
2836  *
2837  * Records the label bound to a port.
2838  *
2839  * Returns 0
2840  */
2841 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2842                                 int addrlen)
2843 {
2844         if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2845                 smk_ipv6_port_label(sock, address);
2846         return 0;
2847 }
2848 #endif /* SMACK_IPV6_PORT_LABELING */
2849 
2850 /**
2851  * smack_socket_connect - connect access check
2852  * @sock: the socket
2853  * @sap: the other end
2854  * @addrlen: size of sap
2855  *
2856  * Verifies that a connection may be possible
2857  *
2858  * Returns 0 on success, and error code otherwise
2859  */
2860 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2861                                 int addrlen)
2862 {
2863         int rc = 0;
2864 #if IS_ENABLED(CONFIG_IPV6)
2865         struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2866 #endif
2867 #ifdef SMACK_IPV6_SECMARK_LABELING
2868         struct smack_known *rsp;
2869         struct socket_smack *ssp = sock->sk->sk_security;
2870 #endif
2871 
2872         if (sock->sk == NULL)
2873                 return 0;
2874 
2875         switch (sock->sk->sk_family) {
2876         case PF_INET:
2877                 if (addrlen < sizeof(struct sockaddr_in))
2878                         return -EINVAL;
2879                 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2880                 break;
2881         case PF_INET6:
2882                 if (addrlen < sizeof(struct sockaddr_in6))
2883                         return -EINVAL;
2884 #ifdef SMACK_IPV6_SECMARK_LABELING
2885                 rsp = smack_ipv6host_label(sip);
2886                 if (rsp != NULL)
2887                         rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2888                                                 SMK_CONNECTING);
2889 #endif
2890 #ifdef SMACK_IPV6_PORT_LABELING
2891                 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2892 #endif
2893                 break;
2894         }
2895         return rc;
2896 }
2897 
2898 /**
2899  * smack_flags_to_may - convert S_ to MAY_ values
2900  * @flags: the S_ value
2901  *
2902  * Returns the equivalent MAY_ value
2903  */
2904 static int smack_flags_to_may(int flags)
2905 {
2906         int may = 0;
2907 
2908         if (flags & S_IRUGO)
2909                 may |= MAY_READ;
2910         if (flags & S_IWUGO)
2911                 may |= MAY_WRITE;
2912         if (flags & S_IXUGO)
2913                 may |= MAY_EXEC;
2914 
2915         return may;
2916 }
2917 
2918 /**
2919  * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2920  * @msg: the object
2921  *
2922  * Returns 0
2923  */
2924 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2925 {
2926         struct smack_known *skp = smk_of_current();
2927 
2928         msg->security = skp;
2929         return 0;
2930 }
2931 
2932 /**
2933  * smack_msg_msg_free_security - Clear the security blob for msg_msg
2934  * @msg: the object
2935  *
2936  * Clears the blob pointer
2937  */
2938 static void smack_msg_msg_free_security(struct msg_msg *msg)
2939 {
2940         msg->security = NULL;
2941 }
2942 
2943 /**
2944  * smack_of_shm - the smack pointer for the shm
2945  * @shp: the object
2946  *
2947  * Returns a pointer to the smack value
2948  */
2949 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2950 {
2951         return (struct smack_known *)shp->shm_perm.security;
2952 }
2953 
2954 /**
2955  * smack_shm_alloc_security - Set the security blob for shm
2956  * @shp: the object
2957  *
2958  * Returns 0
2959  */
2960 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2961 {
2962         struct kern_ipc_perm *isp = &shp->shm_perm;
2963         struct smack_known *skp = smk_of_current();
2964 
2965         isp->security = skp;
2966         return 0;
2967 }
2968 
2969 /**
2970  * smack_shm_free_security - Clear the security blob for shm
2971  * @shp: the object
2972  *
2973  * Clears the blob pointer
2974  */
2975 static void smack_shm_free_security(struct shmid_kernel *shp)
2976 {
2977         struct kern_ipc_perm *isp = &shp->shm_perm;
2978 
2979         isp->security = NULL;
2980 }
2981 
2982 /**
2983  * smk_curacc_shm : check if current has access on shm
2984  * @shp : the object
2985  * @access : access requested
2986  *
2987  * Returns 0 if current has the requested access, error code otherwise
2988  */
2989 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2990 {
2991         struct smack_known *ssp = smack_of_shm(shp);
2992         struct smk_audit_info ad;
2993         int rc;
2994 
2995 #ifdef CONFIG_AUDIT
2996         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2997         ad.a.u.ipc_id = shp->shm_perm.id;
2998 #endif
2999         rc = smk_curacc(ssp, access, &ad);
3000         rc = smk_bu_current("shm", ssp, access, rc);
3001         return rc;
3002 }
3003 
3004 /**
3005  * smack_shm_associate - Smack access check for shm
3006  * @shp: the object
3007  * @shmflg: access requested
3008  *
3009  * Returns 0 if current has the requested access, error code otherwise
3010  */
3011 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
3012 {
3013         int may;
3014 
3015         may = smack_flags_to_may(shmflg);
3016         return smk_curacc_shm(shp, may);
3017 }
3018 
3019 /**
3020  * smack_shm_shmctl - Smack access check for shm
3021  * @shp: the object
3022  * @cmd: what it wants to do
3023  *
3024  * Returns 0 if current has the requested access, error code otherwise
3025  */
3026 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
3027 {
3028         int may;
3029 
3030         switch (cmd) {
3031         case IPC_STAT:
3032         case SHM_STAT:
3033                 may = MAY_READ;
3034                 break;
3035         case IPC_SET:
3036         case SHM_LOCK:
3037         case SHM_UNLOCK:
3038         case IPC_RMID:
3039                 may = MAY_READWRITE;
3040                 break;
3041         case IPC_INFO:
3042         case SHM_INFO:
3043                 /*
3044                  * System level information.
3045                  */
3046                 return 0;
3047         default:
3048                 return -EINVAL;
3049         }
3050         return smk_curacc_shm(shp, may);
3051 }
3052 
3053 /**
3054  * smack_shm_shmat - Smack access for shmat
3055  * @shp: the object
3056  * @shmaddr: unused
3057  * @shmflg: access requested
3058  *
3059  * Returns 0 if current has the requested access, error code otherwise
3060  */
3061 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3062                            int shmflg)
3063 {
3064         int may;
3065 
3066         may = smack_flags_to_may(shmflg);
3067         return smk_curacc_shm(shp, may);
3068 }
3069 
3070 /**
3071  * smack_of_sem - the smack pointer for the sem
3072  * @sma: the object
3073  *
3074  * Returns a pointer to the smack value
3075  */
3076 static struct smack_known *smack_of_sem(struct sem_array *sma)
3077 {
3078         return (struct smack_known *)sma->sem_perm.security;
3079 }
3080 
3081 /**
3082  * smack_sem_alloc_security - Set the security blob for sem
3083  * @sma: the object
3084  *
3085  * Returns 0
3086  */
3087 static int smack_sem_alloc_security(struct sem_array *sma)
3088 {
3089         struct kern_ipc_perm *isp = &sma->sem_perm;
3090         struct smack_known *skp = smk_of_current();
3091 
3092         isp->security = skp;
3093         return 0;
3094 }
3095 
3096 /**
3097  * smack_sem_free_security - Clear the security blob for sem
3098  * @sma: the object
3099  *
3100  * Clears the blob pointer
3101  */
3102 static void smack_sem_free_security(struct sem_array *sma)
3103 {
3104         struct kern_ipc_perm *isp = &sma->sem_perm;
3105 
3106         isp->security = NULL;
3107 }
3108 
3109 /**
3110  * smk_curacc_sem : check if current has access on sem
3111  * @sma : the object
3112  * @access : access requested
3113  *
3114  * Returns 0 if current has the requested access, error code otherwise
3115  */
3116 static int smk_curacc_sem(struct sem_array *sma, int access)
3117 {
3118         struct smack_known *ssp = smack_of_sem(sma);
3119         struct smk_audit_info ad;
3120         int rc;
3121 
3122 #ifdef CONFIG_AUDIT
3123         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3124         ad.a.u.ipc_id = sma->sem_perm.id;
3125 #endif
3126         rc = smk_curacc(ssp, access, &ad);
3127         rc = smk_bu_current("sem", ssp, access, rc);
3128         return rc;
3129 }
3130 
3131 /**
3132  * smack_sem_associate - Smack access check for sem
3133  * @sma: the object
3134  * @semflg: access requested
3135  *
3136  * Returns 0 if current has the requested access, error code otherwise
3137  */
3138 static int smack_sem_associate(struct sem_array *sma, int semflg)
3139 {
3140         int may;
3141 
3142         may = smack_flags_to_may(semflg);
3143         return smk_curacc_sem(sma, may);
3144 }
3145 
3146 /**
3147  * smack_sem_shmctl - Smack access check for sem
3148  * @sma: the object
3149  * @cmd: what it wants to do
3150  *
3151  * Returns 0 if current has the requested access, error code otherwise
3152  */
3153 static int smack_sem_semctl(struct sem_array *sma, int cmd)
3154 {
3155         int may;
3156 
3157         switch (cmd) {
3158         case GETPID:
3159         case GETNCNT:
3160         case GETZCNT:
3161         case GETVAL:
3162         case GETALL:
3163         case IPC_STAT:
3164         case SEM_STAT:
3165                 may = MAY_READ;
3166                 break;
3167         case SETVAL:
3168         case SETALL:
3169         case IPC_RMID:
3170         case IPC_SET:
3171                 may = MAY_READWRITE;
3172                 break;
3173         case IPC_INFO:
3174         case SEM_INFO:
3175                 /*
3176                  * System level information
3177                  */
3178                 return 0;
3179         default:
3180                 return -EINVAL;
3181         }
3182 
3183         return smk_curacc_sem(sma, may);
3184 }
3185 
3186 /**
3187  * smack_sem_semop - Smack checks of semaphore operations
3188  * @sma: the object
3189  * @sops: unused
3190  * @nsops: unused
3191  * @alter: unused
3192  *
3193  * Treated as read and write in all cases.
3194  *
3195  * Returns 0 if access is allowed, error code otherwise
3196  */
3197 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3198                            unsigned nsops, int alter)
3199 {
3200         return smk_curacc_sem(sma, MAY_READWRITE);
3201 }
3202 
3203 /**
3204  * smack_msg_alloc_security - Set the security blob for msg
3205  * @msq: the object
3206  *
3207  * Returns 0
3208  */
3209 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3210 {
3211         struct kern_ipc_perm *kisp = &msq->q_perm;
3212         struct smack_known *skp = smk_of_current();
3213 
3214         kisp->security = skp;
3215         return 0;
3216 }
3217 
3218 /**
3219  * smack_msg_free_security - Clear the security blob for msg
3220  * @msq: the object
3221  *
3222  * Clears the blob pointer
3223  */
3224 static void smack_msg_queue_free_security(struct msg_queue *msq)
3225 {
3226         struct kern_ipc_perm *kisp = &msq->q_perm;
3227 
3228         kisp->security = NULL;
3229 }
3230 
3231 /**
3232  * smack_of_msq - the smack pointer for the msq
3233  * @msq: the object
3234  *
3235  * Returns a pointer to the smack label entry
3236  */
3237 static struct smack_known *smack_of_msq(struct msg_queue *msq)
3238 {
3239         return (struct smack_known *)msq->q_perm.security;
3240 }
3241 
3242 /**
3243  * smk_curacc_msq : helper to check if current has access on msq
3244  * @msq : the msq
3245  * @access : access requested
3246  *
3247  * return 0 if current has access, error otherwise
3248  */
3249 static int smk_curacc_msq(struct msg_queue *msq, int access)
3250 {
3251         struct smack_known *msp = smack_of_msq(msq);
3252         struct smk_audit_info ad;
3253         int rc;
3254 
3255 #ifdef CONFIG_AUDIT
3256         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3257         ad.a.u.ipc_id = msq->q_perm.id;
3258 #endif
3259         rc = smk_curacc(msp, access, &ad);
3260         rc = smk_bu_current("msq", msp, access, rc);
3261         return rc;
3262 }
3263 
3264 /**
3265  * smack_msg_queue_associate - Smack access check for msg_queue
3266  * @msq: the object
3267  * @msqflg: access requested
3268  *
3269  * Returns 0 if current has the requested access, error code otherwise
3270  */
3271 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3272 {
3273         int may;
3274 
3275         may = smack_flags_to_may(msqflg);
3276         return smk_curacc_msq(msq, may);
3277 }
3278 
3279 /**
3280  * smack_msg_queue_msgctl - Smack access check for msg_queue
3281  * @msq: the object
3282  * @cmd: what it wants to do
3283  *
3284  * Returns 0 if current has the requested access, error code otherwise
3285  */
3286 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3287 {
3288         int may;
3289 
3290         switch (cmd) {
3291         case IPC_STAT:
3292         case MSG_STAT:
3293                 may = MAY_READ;
3294                 break;
3295         case IPC_SET:
3296         case IPC_RMID:
3297                 may = MAY_READWRITE;
3298                 break;
3299         case IPC_INFO:
3300         case MSG_INFO:
3301                 /*
3302                  * System level information
3303                  */
3304                 return 0;
3305         default:
3306                 return -EINVAL;
3307         }
3308 
3309         return smk_curacc_msq(msq, may);
3310 }
3311 
3312 /**
3313  * smack_msg_queue_msgsnd - Smack access check for msg_queue
3314  * @msq: the object
3315  * @msg: unused
3316  * @msqflg: access requested
3317  *
3318  * Returns 0 if current has the requested access, error code otherwise
3319  */
3320 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3321                                   int msqflg)
3322 {
3323         int may;
3324 
3325         may = smack_flags_to_may(msqflg);
3326         return smk_curacc_msq(msq, may);
3327 }
3328 
3329 /**
3330  * smack_msg_queue_msgsnd - Smack access check for msg_queue
3331  * @msq: the object
3332  * @msg: unused
3333  * @target: unused
3334  * @type: unused
3335  * @mode: unused
3336  *
3337  * Returns 0 if current has read and write access, error code otherwise
3338  */
3339 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3340                         struct task_struct *target, long type, int mode)
3341 {
3342         return smk_curacc_msq(msq, MAY_READWRITE);
3343 }
3344 
3345 /**
3346  * smack_ipc_permission - Smack access for ipc_permission()
3347  * @ipp: the object permissions
3348  * @flag: access requested
3349  *
3350  * Returns 0 if current has read and write access, error code otherwise
3351  */
3352 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3353 {
3354         struct smack_known *iskp = ipp->security;
3355         int may = smack_flags_to_may(flag);
3356         struct smk_audit_info ad;
3357         int rc;
3358 
3359 #ifdef CONFIG_AUDIT
3360         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3361         ad.a.u.ipc_id = ipp->id;
3362 #endif
3363         rc = smk_curacc(iskp, may, &ad);
3364         rc = smk_bu_current("svipc", iskp, may, rc);
3365         return rc;
3366 }
3367 
3368 /**
3369  * smack_ipc_getsecid - Extract smack security id
3370  * @ipp: the object permissions
3371  * @secid: where result will be saved
3372  */
3373 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3374 {
3375         struct smack_known *iskp = ipp->security;
3376 
3377         *secid = iskp->smk_secid;
3378 }
3379 
3380 /**
3381  * smack_d_instantiate - Make sure the blob is correct on an inode
3382  * @opt_dentry: dentry where inode will be attached
3383  * @inode: the object
3384  *
3385  * Set the inode's security blob if it hasn't been done already.
3386  */
3387 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3388 {
3389         struct super_block *sbp;
3390         struct superblock_smack *sbsp;
3391         struct inode_smack *isp;
3392         struct smack_known *skp;
3393         struct smack_known *ckp = smk_of_current();
3394         struct smack_known *final;
3395         char trattr[TRANS_TRUE_SIZE];
3396         int transflag = 0;
3397         int rc;
3398         struct dentry *dp;
3399 
3400         if (inode == NULL)
3401                 return;
3402 
3403         isp = inode->i_security;
3404 
3405         mutex_lock(&isp->smk_lock);
3406         /*
3407          * If the inode is already instantiated
3408          * take the quick way out
3409          */
3410         if (isp->smk_flags & SMK_INODE_INSTANT)
3411                 goto unlockandout;
3412 
3413         sbp = inode->i_sb;
3414         sbsp = sbp->s_security;
3415         /*
3416          * We're going to use the superblock default label
3417          * if there's no label on the file.
3418          */
3419         final = sbsp->smk_default;
3420 
3421         /*
3422          * If this is the root inode the superblock
3423          * may be in the process of initialization.
3424          * If that is the case use the root value out
3425          * of the superblock.
3426          */
3427         if (opt_dentry->d_parent == opt_dentry) {
3428                 switch (sbp->s_magic) {
3429                 case CGROUP_SUPER_MAGIC:
3430                         /*
3431                          * The cgroup filesystem is never mounted,
3432                          * so there's no opportunity to set the mount
3433                          * options.
3434                          */
3435                         sbsp->smk_root = &smack_known_star;
3436                         sbsp->smk_default = &smack_known_star;
3437                         isp->smk_inode = sbsp->smk_root;
3438                         break;
3439                 case TMPFS_MAGIC:
3440                         /*
3441                          * What about shmem/tmpfs anonymous files with dentry
3442                          * obtained from d_alloc_pseudo()?
3443                          */
3444                         isp->smk_inode = smk_of_current();
3445                         break;
3446                 case PIPEFS_MAGIC:
3447                         isp->smk_inode = smk_of_current();
3448                         break;
3449                 case SOCKFS_MAGIC:
3450                         /*
3451                          * Socket access is controlled by the socket
3452                          * structures associated with the task involved.
3453                          */
3454                         isp->smk_inode = &smack_known_star;
3455                         break;
3456                 default:
3457                         isp->smk_inode = sbsp->smk_root;
3458                         break;
3459                 }
3460                 isp->smk_flags |= SMK_INODE_INSTANT;
3461                 goto unlockandout;
3462         }
3463 
3464         /*
3465          * This is pretty hackish.
3466          * Casey says that we shouldn't have to do
3467          * file system specific code, but it does help
3468          * with keeping it simple.
3469          */
3470         switch (sbp->s_magic) {
3471         case SMACK_MAGIC:
3472         case CGROUP_SUPER_MAGIC:
3473                 /*
3474                  * Casey says that it's a little embarrassing
3475                  * that the smack file system doesn't do
3476                  * extended attributes.
3477                  *
3478                  * Cgroupfs is special
3479                  */
3480                 final = &smack_known_star;
3481                 break;
3482         case DEVPTS_SUPER_MAGIC:
3483                 /*
3484                  * devpts seems content with the label of the task.
3485                  * Programs that change smack have to treat the
3486                  * pty with respect.
3487                  */
3488                 final = ckp;
3489                 break;
3490         case PROC_SUPER_MAGIC:
3491                 /*
3492                  * Casey says procfs appears not to care.
3493                  * The superblock default suffices.
3494                  */
3495                 break;
3496         case TMPFS_MAGIC:
3497                 /*
3498                  * Device labels should come from the filesystem,
3499                  * but watch out, because they're volitile,
3500                  * getting recreated on every reboot.
3501                  */
3502                 final = &smack_known_star;
3503                 /*
3504                  * No break.
3505                  *
3506                  * If a smack value has been set we want to use it,
3507                  * but since tmpfs isn't giving us the opportunity
3508                  * to set mount options simulate setting the
3509                  * superblock default.
3510                  */
3511         default:
3512                 /*
3513                  * This isn't an understood special case.
3514                  * Get the value from the xattr.
3515                  */
3516 
3517                 /*
3518                  * UNIX domain sockets use lower level socket data.
3519                  */
3520                 if (S_ISSOCK(inode->i_mode)) {
3521                         final = &smack_known_star;
3522                         break;
3523                 }
3524                 /*
3525                  * No xattr support means, alas, no SMACK label.
3526                  * Use the aforeapplied default.
3527                  * It would be curious if the label of the task
3528                  * does not match that assigned.
3529                  */
3530                 if (!(inode->i_opflags & IOP_XATTR))
3531                         break;
3532                 /*
3533                  * Get the dentry for xattr.
3534                  */
3535                 dp = dget(opt_dentry);
3536                 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3537                 if (!IS_ERR_OR_NULL(skp))
3538                         final = skp;
3539 
3540                 /*
3541                  * Transmuting directory
3542                  */
3543                 if (S_ISDIR(inode->i_mode)) {
3544                         /*
3545                          * If this is a new directory and the label was
3546                          * transmuted when the inode was initialized
3547                          * set the transmute attribute on the directory
3548                          * and mark the inode.
3549                          *
3550                          * If there is a transmute attribute on the
3551                          * directory mark the inode.
3552                          */
3553                         if (isp->smk_flags & SMK_INODE_CHANGED) {
3554                                 isp->smk_flags &= ~SMK_INODE_CHANGED;
3555                                 rc = __vfs_setxattr(dp, inode,
3556                                         XATTR_NAME_SMACKTRANSMUTE,
3557                                         TRANS_TRUE, TRANS_TRUE_SIZE,
3558                                         0);
3559                         } else {
3560                                 rc = __vfs_getxattr(dp, inode,
3561                                         XATTR_NAME_SMACKTRANSMUTE, trattr,
3562                                         TRANS_TRUE_SIZE);
3563                                 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3564                                                        TRANS_TRUE_SIZE) != 0)
3565                                         rc = -EINVAL;
3566                         }
3567                         if (rc >= 0)
3568                                 transflag = SMK_INODE_TRANSMUTE;
3569                 }
3570                 /*
3571                  * Don't let the exec or mmap label be "*" or "@".
3572                  */
3573                 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3574                 if (IS_ERR(skp) || skp == &smack_known_star ||
3575                     skp == &smack_known_web)
3576                         skp = NULL;
3577                 isp->smk_task = skp;
3578 
3579                 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3580                 if (IS_ERR(skp) || skp == &smack_known_star ||
3581                     skp == &smack_known_web)
3582                         skp = NULL;
3583                 isp->smk_mmap = skp;
3584 
3585                 dput(dp);
3586                 break;
3587         }
3588 
3589         if (final == NULL)
3590                 isp->smk_inode = ckp;
3591         else
3592                 isp->smk_inode = final;
3593 
3594         isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3595 
3596 unlockandout:
3597         mutex_unlock(&isp->smk_lock);
3598         return;
3599 }
3600 
3601 /**
3602  * smack_getprocattr - Smack process attribute access
3603  * @p: the object task
3604  * @name: the name of the attribute in /proc/.../attr
3605  * @value: where to put the result
3606  *
3607  * Places a copy of the task Smack into value
3608  *
3609  * Returns the length of the smack label or an error code
3610  */
3611 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3612 {
3613         struct smack_known *skp = smk_of_task_struct(p);
3614         char *cp;
3615         int slen;
3616 
3617         if (strcmp(name, "current") != 0)
3618                 return -EINVAL;
3619 
3620         cp = kstrdup(skp->smk_known, GFP_KERNEL);
3621         if (cp == NULL)
3622                 return -ENOMEM;
3623 
3624         slen = strlen(cp);
3625         *value = cp;
3626         return slen;
3627 }
3628 
3629 /**
3630  * smack_setprocattr - Smack process attribute setting
3631  * @name: the name of the attribute in /proc/.../attr
3632  * @value: the value to set
3633  * @size: the size of the value
3634  *
3635  * Sets the Smack value of the task. Only setting self
3636  * is permitted and only with privilege
3637  *
3638  * Returns the length of the smack label or an error code
3639  */
3640 static int smack_setprocattr(const char *name, void *value, size_t size)
3641 {
3642         struct task_smack *tsp = current_security();
3643         struct cred *new;
3644         struct smack_known *skp;
3645         struct smack_known_list_elem *sklep;
3646         int rc;
3647 
3648         if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3649                 return -EPERM;
3650 
3651         if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3652                 return -EINVAL;
3653 
3654         if (strcmp(name, "current") != 0)
3655                 return -EINVAL;
3656 
3657         skp = smk_import_entry(value, size);
3658         if (IS_ERR(skp))
3659                 return PTR_ERR(skp);
3660 
3661         /*
3662          * No process is ever allowed the web ("@") label
3663          * and the star ("*") label.
3664          */
3665         if (skp == &smack_known_web || skp == &smack_known_star)
3666                 return -EINVAL;
3667 
3668         if (!smack_privileged(CAP_MAC_ADMIN)) {
3669                 rc = -EPERM;
3670                 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3671                         if (sklep->smk_label == skp) {
3672                                 rc = 0;
3673                                 break;
3674                         }
3675                 if (rc)
3676                         return rc;
3677         }
3678 
3679         new = prepare_creds();
3680         if (new == NULL)
3681                 return -ENOMEM;
3682 
3683         tsp = new->security;
3684         tsp->smk_task = skp;
3685         /*
3686          * process can change its label only once
3687          */
3688         smk_destroy_label_list(&tsp->smk_relabel);
3689 
3690         commit_creds(new);
3691         return size;
3692 }
3693 
3694 /**
3695  * smack_unix_stream_connect - Smack access on UDS
3696  * @sock: one sock
3697  * @other: the other sock
3698  * @newsk: unused
3699  *
3700  * Return 0 if a subject with the smack of sock could access
3701  * an object with the smack of other, otherwise an error code
3702  */
3703 static int smack_unix_stream_connect(struct sock *sock,
3704                                      struct sock *other, struct sock *newsk)
3705 {
3706         struct smack_known *skp;
3707         struct smack_known *okp;
3708         struct socket_smack *ssp = sock->sk_security;
3709         struct socket_smack *osp = other->sk_security;
3710         struct socket_smack *nsp = newsk->sk_security;
3711         struct smk_audit_info ad;
3712         int rc = 0;
3713 #ifdef CONFIG_AUDIT
3714         struct lsm_network_audit net;
3715 #endif
3716 
3717         if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3718                 skp = ssp->smk_out;
3719                 okp = osp->smk_in;
3720 #ifdef CONFIG_AUDIT
3721                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3722                 smk_ad_setfield_u_net_sk(&ad, other);
3723 #endif
3724                 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3725                 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3726                 if (rc == 0) {
3727                         okp = osp->smk_out;
3728                         skp = ssp->smk_in;
3729                         rc = smk_access(okp, skp, MAY_WRITE, &ad);
3730                         rc = smk_bu_note("UDS connect", okp, skp,
3731                                                 MAY_WRITE, rc);
3732                 }
3733         }
3734 
3735         /*
3736          * Cross reference the peer labels for SO_PEERSEC.
3737          */
3738         if (rc == 0) {
3739                 nsp->smk_packet = ssp->smk_out;
3740                 ssp->smk_packet = osp->smk_out;
3741         }
3742 
3743         return rc;
3744 }
3745 
3746 /**
3747  * smack_unix_may_send - Smack access on UDS
3748  * @sock: one socket
3749  * @other: the other socket
3750  *
3751  * Return 0 if a subject with the smack of sock could access
3752  * an object with the smack of other, otherwise an error code
3753  */
3754 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3755 {
3756         struct socket_smack *ssp = sock->sk->sk_security;
3757         struct socket_smack *osp = other->sk->sk_security;
3758         struct smk_audit_info ad;
3759         int rc;
3760 
3761 #ifdef CONFIG_AUDIT
3762         struct lsm_network_audit net;
3763 
3764         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3765         smk_ad_setfield_u_net_sk(&ad, other->sk);
3766 #endif
3767 
3768         if (smack_privileged(CAP_MAC_OVERRIDE))
3769                 return 0;
3770 
3771         rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3772         rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3773         return rc;
3774 }
3775 
3776 /**
3777  * smack_socket_sendmsg - Smack check based on destination host
3778  * @sock: the socket
3779  * @msg: the message
3780  * @size: the size of the message
3781  *
3782  * Return 0 if the current subject can write to the destination host.
3783  * For IPv4 this is only a question if the destination is a single label host.
3784  * For IPv6 this is a check against the label of the port.
3785  */
3786 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3787                                 int size)
3788 {
3789         struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3790 #if IS_ENABLED(CONFIG_IPV6)
3791         struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3792 #endif
3793 #ifdef SMACK_IPV6_SECMARK_LABELING
3794         struct socket_smack *ssp = sock->sk->sk_security;
3795         struct smack_known *rsp;
3796 #endif
3797         int rc = 0;
3798 
3799         /*
3800          * Perfectly reasonable for this to be NULL
3801          */
3802         if (sip == NULL)
3803                 return 0;
3804 
3805         switch (sock->sk->sk_family) {
3806         case AF_INET:
3807                 rc = smack_netlabel_send(sock->sk, sip);
3808                 break;
3809         case AF_INET6:
3810 #ifdef SMACK_IPV6_SECMARK_LABELING
3811                 rsp = smack_ipv6host_label(sap);
3812                 if (rsp != NULL)
3813                         rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3814                                                 SMK_CONNECTING);
3815 #endif
3816 #ifdef SMACK_IPV6_PORT_LABELING
3817                 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3818 #endif
3819                 break;
3820         }
3821         return rc;
3822 }
3823 
3824 /**
3825  * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3826  * @sap: netlabel secattr
3827  * @ssp: socket security information
3828  *
3829  * Returns a pointer to a Smack label entry found on the label list.
3830  */
3831 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3832                                                 struct socket_smack *ssp)
3833 {
3834         struct smack_known *skp;
3835         int found = 0;
3836         int acat;
3837         int kcat;
3838 
3839         if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3840                 /*
3841                  * Looks like a CIPSO packet.
3842                  * If there are flags but no level netlabel isn't
3843                  * behaving the way we expect it to.
3844                  *
3845                  * Look it up in the label table
3846                  * Without guidance regarding the smack value
3847                  * for the packet fall back on the network
3848                  * ambient value.
3849                  */
3850                 rcu_read_lock();
3851                 list_for_each_entry_rcu(skp, &smack_known_list, list) {
3852                         if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3853                                 continue;
3854                         /*
3855                          * Compare the catsets. Use the netlbl APIs.
3856                          */
3857                         if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3858                                 if ((skp->smk_netlabel.flags &
3859                                      NETLBL_SECATTR_MLS_CAT) == 0)
3860                                         found = 1;
3861                                 break;
3862                         }
3863                         for (acat = -1, kcat = -1; acat == kcat; ) {
3864                                 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3865                                                           acat + 1);
3866                                 kcat = netlbl_catmap_walk(
3867                                         skp->smk_netlabel.attr.mls.cat,
3868                                         kcat + 1);
3869                                 if (acat < 0 || kcat < 0)
3870                                         break;
3871                         }
3872                         if (acat == kcat) {
3873                                 found = 1;
3874                                 break;
3875                         }
3876                 }
3877                 rcu_read_unlock();
3878 
3879                 if (found)
3880                         return skp;
3881 
3882                 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3883                         return &smack_known_web;
3884                 return &smack_known_star;
3885         }
3886         if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
3887                 /*
3888                  * Looks like a fallback, which gives us a secid.
3889                  */
3890                 return smack_from_secid(sap->attr.secid);
3891         /*
3892          * Without guidance regarding the smack value
3893          * for the packet fall back on the network
3894          * ambient value.
3895          */
3896         return smack_net_ambient;
3897 }
3898 
3899 #if IS_ENABLED(CONFIG_IPV6)
3900 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3901 {
3902         u8 nexthdr;
3903         int offset;
3904         int proto = -EINVAL;
3905         struct ipv6hdr _ipv6h;
3906         struct ipv6hdr *ip6;
3907         __be16 frag_off;
3908         struct tcphdr _tcph, *th;
3909         struct udphdr _udph, *uh;
3910         struct dccp_hdr _dccph, *dh;
3911 
3912         sip->sin6_port = 0;
3913 
3914         offset = skb_network_offset(skb);
3915         ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3916         if (ip6 == NULL)
3917                 return -EINVAL;
3918         sip->sin6_addr = ip6->saddr;
3919 
3920         nexthdr = ip6->nexthdr;
3921         offset += sizeof(_ipv6h);
3922         offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3923         if (offset < 0)
3924                 return -EINVAL;
3925 
3926         proto = nexthdr;
3927         switch (proto) {
3928         case IPPROTO_TCP:
3929                 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3930                 if (th != NULL)
3931                         sip->sin6_port = th->source;
3932                 break;
3933         case IPPROTO_UDP:
3934                 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3935                 if (uh != NULL)
3936                         sip->sin6_port = uh->source;
3937                 break;
3938         case IPPROTO_DCCP:
3939                 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3940                 if (dh != NULL)
3941                         sip->sin6_port = dh->dccph_sport;
3942                 break;
3943         }
3944         return proto;
3945 }
3946 #endif /* CONFIG_IPV6 */
3947 
3948 /**
3949  * smack_socket_sock_rcv_skb - Smack packet delivery access check
3950  * @sk: socket
3951  * @skb: packet
3952  *
3953  * Returns 0 if the packet should be delivered, an error code otherwise
3954  */
3955 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3956 {
3957         struct netlbl_lsm_secattr secattr;
3958         struct socket_smack *ssp = sk->sk_security;
3959         struct smack_known *skp = NULL;
3960         int rc = 0;
3961         struct smk_audit_info ad;
3962 #ifdef CONFIG_AUDIT
3963         struct lsm_network_audit net;
3964 #endif
3965 #if IS_ENABLED(CONFIG_IPV6)
3966         struct sockaddr_in6 sadd;
3967         int proto;
3968 #endif /* CONFIG_IPV6 */
3969 
3970         switch (sk->sk_family) {
3971         case PF_INET:
3972 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3973                 /*
3974                  * If there is a secmark use it rather than the CIPSO label.
3975                  * If there is no secmark fall back to CIPSO.
3976                  * The secmark is assumed to reflect policy better.
3977                  */
3978                 if (skb && skb->secmark != 0) {
3979                         skp = smack_from_secid(skb->secmark);
3980                         goto access_check;
3981                 }
3982 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3983                 /*
3984                  * Translate what netlabel gave us.
3985                  */
3986                 netlbl_secattr_init(&secattr);
3987 
3988                 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3989                 if (rc == 0)
3990                         skp = smack_from_secattr(&secattr, ssp);
3991                 else
3992                         skp = smack_net_ambient;
3993 
3994                 netlbl_secattr_destroy(&secattr);
3995 
3996 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3997 access_check:
3998 #endif
3999 #ifdef CONFIG_AUDIT
4000                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4001                 ad.a.u.net->family = sk->sk_family;
4002                 ad.a.u.net->netif = skb->skb_iif;
4003                 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4004 #endif
4005                 /*
4006                  * Receiving a packet requires that the other end
4007                  * be able to write here. Read access is not required.
4008                  * This is the simplist possible security model
4009                  * for networking.
4010                  */
4011                 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4012                 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
4013                                         MAY_WRITE, rc);
4014                 if (rc != 0)
4015                         netlbl_skbuff_err(skb, sk->sk_family, rc, 0);
4016                 break;
4017 #if IS_ENABLED(CONFIG_IPV6)
4018         case PF_INET6:
4019                 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4020                 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4021                         break;
4022 #ifdef SMACK_IPV6_SECMARK_LABELING
4023                 if (skb && skb->secmark != 0)
4024                         skp = smack_from_secid(skb->secmark);
4025                 else
4026                         skp = smack_ipv6host_label(&sadd);
4027                 if (skp == NULL)
4028                         skp = smack_net_ambient;
4029 #ifdef CONFIG_AUDIT
4030                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4031                 ad.a.u.net->family = sk->sk_family;
4032                 ad.a.u.net->netif = skb->skb_iif;
4033                 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4034 #endif /* CONFIG_AUDIT */
4035                 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4036                 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4037                                         MAY_WRITE, rc);
4038 #endif /* SMACK_IPV6_SECMARK_LABELING */
4039 #ifdef SMACK_IPV6_PORT_LABELING
4040                 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4041 #endif /* SMACK_IPV6_PORT_LABELING */
4042                 break;
4043 #endif /* CONFIG_IPV6 */
4044         }
4045 
4046         return rc;
4047 }
4048 
4049 /**
4050  * smack_socket_getpeersec_stream - pull in packet label
4051  * @sock: the socket
4052  * @optval: user's destination
4053  * @optlen: size thereof
4054  * @len: max thereof
4055  *
4056  * returns zero on success, an error code otherwise
4057  */
4058 static int smack_socket_getpeersec_stream(struct socket *sock,
4059                                           char __user *optval,
4060                                           int __user *optlen, unsigned len)
4061 {
4062         struct socket_smack *ssp;
4063         char *rcp = "";
4064         int slen = 1;
4065         int rc = 0;
4066 
4067         ssp = sock->sk->sk_security;
4068         if (ssp->smk_packet != NULL) {
4069                 rcp = ssp->smk_packet->smk_known;
4070                 slen = strlen(rcp) + 1;
4071         }
4072 
4073         if (slen > len)
4074                 rc = -ERANGE;
4075         else if (copy_to_user(optval, rcp, slen) != 0)
4076                 rc = -EFAULT;
4077 
4078         if (put_user(slen, optlen) != 0)
4079                 rc = -EFAULT;
4080 
4081         return rc;
4082 }
4083 
4084 
4085 /**
4086  * smack_socket_getpeersec_dgram - pull in packet label
4087  * @sock: the peer socket
4088  * @skb: packet data
4089  * @secid: pointer to where to put the secid of the packet
4090  *
4091  * Sets the netlabel socket state on sk from parent
4092  */
4093 static int smack_socket_getpeersec_dgram(struct socket *sock,
4094                                          struct sk_buff *skb, u32 *secid)
4095 
4096 {
4097         struct netlbl_lsm_secattr secattr;
4098         struct socket_smack *ssp = NULL;
4099         struct smack_known *skp;
4100         int family = PF_UNSPEC;
4101         u32 s = 0;      /* 0 is the invalid secid */
4102         int rc;
4103 
4104         if (skb != NULL) {
4105                 if (skb->protocol == htons(ETH_P_IP))
4106                         family = PF_INET;
4107 #if IS_ENABLED(CONFIG_IPV6)
4108                 else if (skb->protocol == htons(ETH_P_IPV6))
4109                         family = PF_INET6;
4110 #endif /* CONFIG_IPV6 */
4111         }
4112         if (family == PF_UNSPEC && sock != NULL)
4113                 family = sock->sk->sk_family;
4114 
4115         switch (family) {
4116         case PF_UNIX:
4117                 ssp = sock->sk->sk_security;
4118                 s = ssp->smk_out->smk_secid;
4119                 break;
4120         case PF_INET:
4121 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4122                 s = skb->secmark;
4123                 if (s != 0)
4124                         break;
4125 #endif
4126                 /*
4127                  * Translate what netlabel gave us.
4128                  */
4129                 if (sock != NULL && sock->sk != NULL)
4130                         ssp = sock->sk->sk_security;
4131                 netlbl_secattr_init(&secattr);
4132                 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4133                 if (rc == 0) {
4134                         skp = smack_from_secattr(&secattr, ssp);
4135                         s = skp->smk_secid;
4136                 }
4137                 netlbl_secattr_destroy(&secattr);
4138                 break;
4139         case PF_INET6:
4140 #ifdef SMACK_IPV6_SECMARK_LABELING
4141                 s = skb->secmark;
4142 #endif
4143                 break;
4144         }
4145         *secid = s;
4146         if (s == 0)
4147                 return -EINVAL;
4148         return 0;
4149 }
4150 
4151 /**
4152  * smack_sock_graft - Initialize a newly created socket with an existing sock
4153  * @sk: child sock
4154  * @parent: parent socket
4155  *
4156  * Set the smk_{in,out} state of an existing sock based on the process that
4157  * is creating the new socket.
4158  */
4159 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4160 {
4161         struct socket_smack *ssp;
4162         struct smack_known *skp = smk_of_current();
4163 
4164         if (sk == NULL ||
4165             (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4166                 return;
4167 
4168         ssp = sk->sk_security;
4169         ssp->smk_in = skp;
4170         ssp->smk_out = skp;
4171         /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4172 }
4173 
4174 /**
4175  * smack_inet_conn_request - Smack access check on connect
4176  * @sk: socket involved
4177  * @skb: packet
4178  * @req: unused
4179  *
4180  * Returns 0 if a task with the packet label could write to
4181  * the socket, otherwise an error code
4182  */
4183 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4184                                    struct request_sock *req)
4185 {
4186         u16 family = sk->sk_family;
4187         struct smack_known *skp;
4188         struct socket_smack *ssp = sk->sk_security;
4189         struct netlbl_lsm_secattr secattr;
4190         struct sockaddr_in addr;
4191         struct iphdr *hdr;
4192         struct smack_known *hskp;
4193         int rc;
4194         struct smk_audit_info ad;
4195 #ifdef CONFIG_AUDIT
4196         struct lsm_network_audit net;
4197 #endif
4198 
4199 #if IS_ENABLED(CONFIG_IPV6)
4200         if (family == PF_INET6) {
4201                 /*
4202                  * Handle mapped IPv4 packets arriving
4203                  * via IPv6 sockets. Don't set up netlabel
4204                  * processing on IPv6.
4205                  */
4206                 if (skb->protocol == htons(ETH_P_IP))
4207                         family = PF_INET;
4208                 else
4209                         return 0;
4210         }
4211 #endif /* CONFIG_IPV6 */
4212 
4213 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4214         /*
4215          * If there is a secmark use it rather than the CIPSO label.
4216          * If there is no secmark fall back to CIPSO.
4217          * The secmark is assumed to reflect policy better.
4218          */
4219         if (skb && skb->secmark != 0) {
4220                 skp = smack_from_secid(skb->secmark);
4221                 goto access_check;
4222         }
4223 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4224 
4225         netlbl_secattr_init(&secattr);
4226         rc = netlbl_skbuff_getattr(skb, family, &secattr);
4227         if (rc == 0)
4228                 skp = smack_from_secattr(&secattr, ssp);
4229         else
4230                 skp = &smack_known_huh;
4231         netlbl_secattr_destroy(&secattr);
4232 
4233 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4234 access_check:
4235 #endif
4236 
4237 #ifdef CONFIG_AUDIT
4238         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4239         ad.a.u.net->family = family;
4240         ad.a.u.net->netif = skb->skb_iif;
4241         ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4242 #endif
4243         /*
4244          * Receiving a packet requires that the other end be able to write
4245          * here. Read access is not required.
4246          */
4247         rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4248         rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4249         if (rc != 0)
4250                 return rc;
4251 
4252         /*
4253          * Save the peer's label in the request_sock so we can later setup
4254          * smk_packet in the child socket so that SO_PEERCRED can report it.
4255          */
4256         req->peer_secid = skp->smk_secid;
4257 
4258         /*
4259          * We need to decide if we want to label the incoming connection here
4260          * if we do we only need to label the request_sock and the stack will
4261          * propagate the wire-label to the sock when it is created.
4262          */
4263         hdr = ip_hdr(skb);
4264         addr.sin_addr.s_addr = hdr->saddr;
4265         rcu_read_lock();
4266         hskp = smack_ipv4host_label(&addr);
4267         rcu_read_unlock();
4268 
4269         if (hskp == NULL)
4270                 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4271         else
4272                 netlbl_req_delattr(req);
4273 
4274         return rc;
4275 }
4276 
4277 /**
4278  * smack_inet_csk_clone - Copy the connection information to the new socket
4279  * @sk: the new socket
4280  * @req: the connection's request_sock
4281  *
4282  * Transfer the connection's peer label to the newly created socket.
4283  */
4284 static void smack_inet_csk_clone(struct sock *sk,
4285                                  const struct request_sock *req)
4286 {
4287         struct socket_smack *ssp = sk->sk_security;
4288         struct smack_known *skp;
4289 
4290         if (req->peer_secid != 0) {
4291                 skp = smack_from_secid(req->peer_secid);
4292                 ssp->smk_packet = skp;
4293         } else
4294                 ssp->smk_packet = NULL;
4295 }
4296 
4297 /*
4298  * Key management security hooks
4299  *
4300  * Casey has not tested key support very heavily.
4301  * The permission check is most likely too restrictive.
4302  * If you care about keys please have a look.
4303  */
4304 #ifdef CONFIG_KEYS
4305 
4306 /**
4307  * smack_key_alloc - Set the key security blob
4308  * @key: object
4309  * @cred: the credentials to use
4310  * @flags: unused
4311  *
4312  * No allocation required
4313  *
4314  * Returns 0
4315  */
4316 static int smack_key_alloc(struct key *key, const struct cred *cred,
4317                            unsigned long flags)
4318 {
4319         struct smack_known *skp = smk_of_task(cred->security);
4320 
4321         key->security = skp;
4322         return 0;
4323 }
4324 
4325 /**
4326  * smack_key_free - Clear the key security blob
4327  * @key: the object
4328  *
4329  * Clear the blob pointer
4330  */
4331 static void smack_key_free(struct key *key)
4332 {
4333         key->security = NULL;
4334 }
4335 
4336 /**
4337  * smack_key_permission - Smack access on a key
4338  * @key_ref: gets to the object
4339  * @cred: the credentials to use
4340  * @perm: requested key permissions
4341  *
4342  * Return 0 if the task has read and write to the object,
4343  * an error code otherwise
4344  */
4345 static int smack_key_permission(key_ref_t key_ref,
4346                                 const struct cred *cred, unsigned perm)
4347 {
4348         struct key *keyp;
4349         struct smk_audit_info ad;
4350         struct smack_known *tkp = smk_of_task(cred->security);
4351         int request = 0;
4352         int rc;
4353 
4354         keyp = key_ref_to_ptr(key_ref);
4355         if (keyp == NULL)
4356                 return -EINVAL;
4357         /*
4358          * If the key hasn't been initialized give it access so that
4359          * it may do so.
4360          */
4361         if (keyp->security == NULL)
4362                 return 0;
4363         /*
4364          * This should not occur
4365          */
4366         if (tkp == NULL)
4367                 return -EACCES;
4368 #ifdef CONFIG_AUDIT
4369         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4370         ad.a.u.key_struct.key = keyp->serial;
4371         ad.a.u.key_struct.key_desc = keyp->description;
4372 #endif
4373         if (perm & KEY_NEED_READ)
4374                 request = MAY_READ;
4375         if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4376                 request = MAY_WRITE;
4377         rc = smk_access(tkp, keyp->security, request, &ad);
4378         rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4379         return rc;
4380 }
4381 
4382 /*
4383  * smack_key_getsecurity - Smack label tagging the key
4384  * @key points to the key to be queried
4385  * @_buffer points to a pointer that should be set to point to the
4386  * resulting string (if no label or an error occurs).
4387  * Return the length of the string (including terminating NUL) or -ve if
4388  * an error.
4389  * May also return 0 (and a NULL buffer pointer) if there is no label.
4390  */
4391 static int smack_key_getsecurity(struct key *key, char **_buffer)
4392 {
4393         struct smack_known *skp = key->security;
4394         size_t length;
4395         char *copy;
4396 
4397         if (key->security == NULL) {
4398                 *_buffer = NULL;
4399                 return 0;
4400         }
4401 
4402         copy = kstrdup(skp->smk_known, GFP_KERNEL);
4403         if (copy == NULL)
4404                 return -ENOMEM;
4405         length = strlen(copy) + 1;
4406 
4407         *_buffer = copy;
4408         return length;
4409 }
4410 
4411 #endif /* CONFIG_KEYS */
4412 
4413 /*
4414  * Smack Audit hooks
4415  *
4416  * Audit requires a unique representation of each Smack specific
4417  * rule. This unique representation is used to distinguish the
4418  * object to be audited from remaining kernel objects and also
4419  * works as a glue between the audit hooks.
4420  *
4421  * Since repository entries are added but never deleted, we'll use
4422  * the smack_known label address related to the given audit rule as
4423  * the needed unique representation. This also better fits the smack
4424  * model where nearly everything is a label.
4425  */
4426 #ifdef CONFIG_AUDIT
4427 
4428 /**
4429  * smack_audit_rule_init - Initialize a smack audit rule
4430  * @field: audit rule fields given from user-space (audit.h)
4431  * @op: required testing operator (=, !=, >, <, ...)
4432  * @rulestr: smack label to be audited
4433  * @vrule: pointer to save our own audit rule representation
4434  *
4435  * Prepare to audit cases where (@field @op @rulestr) is true.
4436  * The label to be audited is created if necessay.
4437  */
4438 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4439 {
4440         struct smack_known *skp;
4441         char **rule = (char **)vrule;
4442         *rule = NULL;
4443 
4444         if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4445                 return -EINVAL;
4446 
4447         if (op != Audit_equal && op != Audit_not_equal)
4448                 return -EINVAL;
4449 
4450         skp = smk_import_entry(rulestr, 0);
4451         if (IS_ERR(skp))
4452                 return PTR_ERR(skp);
4453 
4454         *rule = skp->smk_known;
4455 
4456         return 0;
4457 }
4458 
4459 /**
4460  * smack_audit_rule_known - Distinguish Smack audit rules
4461  * @krule: rule of interest, in Audit kernel representation format
4462  *
4463  * This is used to filter Smack rules from remaining Audit ones.
4464  * If it's proved that this rule belongs to us, the
4465  * audit_rule_match hook will be called to do the final judgement.
4466  */
4467 static int smack_audit_rule_known(struct audit_krule *krule)
4468 {
4469         struct audit_field *f;
4470         int i;
4471 
4472         for (i = 0; i < krule->field_count; i++) {
4473                 f = &krule->fields[i];
4474 
4475                 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4476                         return 1;
4477         }
4478 
4479         return 0;
4480 }
4481 
4482 /**
4483  * smack_audit_rule_match - Audit given object ?
4484  * @secid: security id for identifying the object to test
4485  * @field: audit rule flags given from user-space
4486  * @op: required testing operator
4487  * @vrule: smack internal rule presentation
4488  * @actx: audit context associated with the check
4489  *
4490  * The core Audit hook. It's used to take the decision of
4491  * whether to audit or not to audit a given object.
4492  */
4493 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4494                                   struct audit_context *actx)
4495 {
4496         struct smack_known *skp;
4497         char *rule = vrule;
4498 
4499         if (unlikely(!rule)) {
4500                 WARN_ONCE(1, "Smack: missing rule\n");
4501                 return -ENOENT;
4502         }
4503 
4504         if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4505                 return 0;
4506 
4507         skp = smack_from_secid(secid);
4508 
4509         /*
4510          * No need to do string comparisons. If a match occurs,
4511          * both pointers will point to the same smack_known
4512          * label.
4513          */
4514         if (op == Audit_equal)
4515                 return (rule == skp->smk_known);
4516         if (op == Audit_not_equal)
4517                 return (rule != skp->smk_known);
4518 
4519         return 0;
4520 }
4521 
4522 /*
4523  * There is no need for a smack_audit_rule_free hook.
4524  * No memory was allocated.
4525  */
4526 
4527 #endif /* CONFIG_AUDIT */
4528 
4529 /**
4530  * smack_ismaclabel - check if xattr @name references a smack MAC label
4531  * @name: Full xattr name to check.
4532  */
4533 static int smack_ismaclabel(const char *name)
4534 {
4535         return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4536 }
4537 
4538 
4539 /**
4540  * smack_secid_to_secctx - return the smack label for a secid
4541  * @secid: incoming integer
4542  * @secdata: destination
4543  * @seclen: how long it is
4544  *
4545  * Exists for networking code.
4546  */
4547 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4548 {
4549         struct smack_known *skp = smack_from_secid(secid);
4550 
4551         if (secdata)
4552                 *secdata = skp->smk_known;
4553         *seclen = strlen(skp->smk_known);
4554         return 0;
4555 }
4556 
4557 /**
4558  * smack_secctx_to_secid - return the secid for a smack label
4559  * @secdata: smack label
4560  * @seclen: how long result is
4561  * @secid: outgoing integer
4562  *
4563  * Exists for audit and networking code.
4564  */
4565 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4566 {
4567         struct smack_known *skp = smk_find_entry(secdata);
4568 
4569         if (skp)
4570                 *secid = skp->smk_secid;
4571         else
4572                 *secid = 0;
4573         return 0;
4574 }
4575 
4576 /*
4577  * There used to be a smack_release_secctx hook
4578  * that did nothing back when hooks were in a vector.
4579  * Now that there's a list such a hook adds cost.
4580  */
4581 
4582 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4583 {
4584         return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4585 }
4586 
4587 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4588 {
4589         return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4590 }
4591 
4592 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4593 {
4594         int len = 0;
4595         len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4596 
4597         if (len < 0)
4598                 return len;
4599         *ctxlen = len;
4600         return 0;
4601 }
4602 
4603 static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
4604 {
4605 
4606         struct task_smack *tsp;
4607         struct smack_known *skp;
4608         struct inode_smack *isp;
4609         struct cred *new_creds = *new;
4610 
4611         if (new_creds == NULL) {
4612                 new_creds = prepare_creds();
4613                 if (new_creds == NULL)
4614                         return -ENOMEM;
4615         }
4616 
4617         tsp = new_creds->security;
4618 
4619         /*
4620          * Get label from overlay inode and set it in create_sid
4621          */
4622         isp = d_inode(dentry->d_parent)->i_security;
4623         skp = isp->smk_inode;
4624         tsp->smk_task = skp;
4625         *new = new_creds;
4626         return 0;
4627 }
4628 
4629 static int smack_inode_copy_up_xattr(const char *name)
4630 {
4631         /*
4632          * Return 1 if this is the smack access Smack attribute.
4633          */
4634         if (strcmp(name, XATTR_NAME_SMACK) == 0)
4635                 return 1;
4636 
4637         return -EOPNOTSUPP;
4638 }
4639 
4640 static int smack_dentry_create_files_as(struct dentry *dentry, int mode,
4641                                         struct qstr *name,
4642                                         const struct cred *old,
4643                                         struct cred *new)
4644 {
4645         struct task_smack *otsp = old->security;
4646         struct task_smack *ntsp = new->security;
4647         struct inode_smack *isp;
4648         int may;
4649 
4650         /*
4651          * Use the process credential unless all of
4652          * the transmuting criteria are met
4653          */
4654         ntsp->smk_task = otsp->smk_task;
4655 
4656         /*
4657          * the attribute of the containing directory
4658          */
4659         isp = d_inode(dentry->d_parent)->i_security;
4660 
4661         if (isp->smk_flags & SMK_INODE_TRANSMUTE) {
4662                 rcu_read_lock();
4663                 may = smk_access_entry(otsp->smk_task->smk_known,
4664                                        isp->smk_inode->smk_known,
4665                                        &otsp->smk_task->smk_rules);
4666                 rcu_read_unlock();
4667 
4668                 /*
4669                  * If the directory is transmuting and the rule
4670                  * providing access is transmuting use the containing
4671                  * directory label instead of the process label.
4672                  */
4673                 if (may > 0 && (may & MAY_TRANSMUTE))
4674                         ntsp->smk_task = isp->smk_inode;
4675         }
4676         return 0;
4677 }
4678 
4679 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
4680         LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4681         LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4682         LSM_HOOK_INIT(syslog, smack_syslog),
4683 
4684         LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4685         LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4686         LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4687         LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4688         LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4689         LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4690         LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
4691 
4692         LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4693 
4694         LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4695         LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4696         LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4697         LSM_HOOK_INIT(inode_link, smack_inode_link),
4698         LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4699         LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4700         LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4701         LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4702         LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4703         LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4704         LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4705         LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4706         LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4707         LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4708         LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4709         LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4710         LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4711         LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4712 
4713         LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4714         LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4715         LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4716         LSM_HOOK_INIT(file_lock, smack_file_lock),
4717         LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4718         LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4719         LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4720         LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4721         LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4722         LSM_HOOK_INIT(file_receive, smack_file_receive),
4723 
4724         LSM_HOOK_INIT(file_open, smack_file_open),
4725 
4726         LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4727         LSM_HOOK_INIT(cred_free, smack_cred_free),
4728         LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4729         LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4730         LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4731         LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4732         LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4733         LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4734         LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4735         LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4736         LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4737         LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4738         LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4739         LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4740         LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4741         LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4742         LSM_HOOK_INIT(task_kill, smack_task_kill),
4743         LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4744 
4745         LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4746         LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4747 
4748         LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4749         LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4750 
4751         LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4752         LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4753         LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4754         LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4755         LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4756         LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4757 
4758         LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4759         LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4760         LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4761         LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4762         LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4763 
4764         LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4765         LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4766         LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4767         LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4768         LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4769 
4770         LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4771 
4772         LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4773         LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4774 
4775         LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4776         LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4777 
4778         LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4779 #ifdef SMACK_IPV6_PORT_LABELING
4780         LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4781 #endif
4782         LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4783         LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4784         LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4785         LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4786         LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4787         LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4788         LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4789         LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4790         LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4791         LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4792 
4793  /* key management security hooks */
4794 #ifdef CONFIG_KEYS
4795         LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4796         LSM_HOOK_INIT(key_free, smack_key_free),
4797         LSM_HOOK_INIT(key_permission, smack_key_permission),
4798         LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4799 #endif /* CONFIG_KEYS */
4800 
4801  /* Audit hooks */
4802 #ifdef CONFIG_AUDIT
4803         LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4804         LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4805         LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4806 #endif /* CONFIG_AUDIT */
4807 
4808         LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4809         LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4810         LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4811         LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4812         LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4813         LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4814         LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up),
4815         LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr),
4816         LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as),
4817 };
4818 
4819 
4820 static __init void init_smack_known_list(void)
4821 {
4822         /*
4823          * Initialize rule list locks
4824          */
4825         mutex_init(&smack_known_huh.smk_rules_lock);
4826         mutex_init(&smack_known_hat.smk_rules_lock);
4827         mutex_init(&smack_known_floor.smk_rules_lock);
4828         mutex_init(&smack_known_star.smk_rules_lock);
4829         mutex_init(&smack_known_web.smk_rules_lock);
4830         /*
4831          * Initialize rule lists
4832          */
4833         INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4834         INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4835         INIT_LIST_HEAD(&smack_known_star.smk_rules);
4836         INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4837         INIT_LIST_HEAD(&smack_known_web.smk_rules);
4838         /*
4839          * Create the known labels list
4840          */
4841         smk_insert_entry(&smack_known_huh);
4842         smk_insert_entry(&smack_known_hat);
4843         smk_insert_entry(&smack_known_star);
4844         smk_insert_entry(&smack_known_floor);
4845         smk_insert_entry(&smack_known_web);
4846 }
4847 
4848 /**
4849  * smack_init - initialize the smack system
4850  *
4851  * Returns 0
4852  */
4853 static __init int smack_init(void)
4854 {
4855         struct cred *cred;
4856         struct task_smack *tsp;
4857 
4858         if (!security_module_enable("smack"))
4859                 return 0;
4860 
4861         smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4862         if (!smack_inode_cache)
4863                 return -ENOMEM;
4864 
4865         tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4866                                 GFP_KERNEL);
4867         if (tsp == NULL) {
4868                 kmem_cache_destroy(smack_inode_cache);
4869                 return -ENOMEM;
4870         }
4871 
4872         smack_enabled = 1;
4873 
4874         pr_info("Smack:  Initializing.\n");
4875 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4876         pr_info("Smack:  Netfilter enabled.\n");
4877 #endif
4878 #ifdef SMACK_IPV6_PORT_LABELING
4879         pr_info("Smack:  IPv6 port labeling enabled.\n");
4880 #endif
4881 #ifdef SMACK_IPV6_SECMARK_LABELING
4882         pr_info("Smack:  IPv6 Netfilter enabled.\n");
4883 #endif
4884 
4885         /*
4886          * Set the security state for the initial task.
4887          */
4888         cred = (struct cred *) current->cred;
4889         cred->security = tsp;
4890 
4891         /* initialize the smack_known_list */
4892         init_smack_known_list();
4893 
4894         /*
4895          * Register with LSM
4896          */
4897         security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
4898 
4899         return 0;
4900 }
4901 
4902 /*
4903  * Smack requires early initialization in order to label
4904  * all processes and objects when they are created.
4905  */
4906 security_initcall(smack_init);
4907 

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